- •Features
- •Pin Configurations
- •Disclaimer
- •Overview
- •Block Diagram
- •AT90S8535 Compatibility
- •Pin Descriptions
- •Port A (PA7..PA0)
- •Port B (PB7..PB0)
- •Port C (PC7..PC0)
- •Port D (PD7..PD0)
- •RESET
- •XTAL1
- •XTAL2
- •AVCC
- •AREF
- •Resources
- •AVR CPU Core
- •Introduction
- •Architectural Overview
- •Status Register
- •Stack Pointer
- •Interrupt Response Time
- •SRAM Data Memory
- •Data Memory Access Times
- •EEPROM Data Memory
- •EEPROM Read/Write Access
- •I/O Memory
- •Clock Systems and their Distribution
- •Clock Sources
- •Default Clock Source
- •Crystal Oscillator
- •External RC Oscillator
- •External Clock
- •Timer/Counter Oscillator
- •Idle Mode
- •Power-down Mode
- •Power-save Mode
- •Standby Mode
- •Extended Standby Mode
- •Analog-to-Digital Converter
- •Analog Comparator
- •Brown-out Detector
- •Internal Voltage Reference
- •Watchdog Timer
- •Port Pins
- •Resetting the AVR
- •Reset Sources
- •Power-on Reset
- •External Reset
- •Brown-out Detection
- •Watchdog Reset
- •Watchdog Timer
- •Timed Sequences for Changing the Configuration of the Watchdog Timer
- •Safety Level 0
- •Safety Level 1
- •Safety Level 2
- •Interrupts
- •I/O-Ports
- •Introduction
- •Configuring the Pin
- •Reading the Pin Value
- •Unconnected pins
- •Alternate Port Functions
- •Alternate Functions of Port A
- •Alternate Functions Of Port B
- •Alternate Functions of Port C
- •Alternate Functions of Port D
- •External Interrupts
- •8-bit Timer/Counter0 with PWM
- •Overview
- •Registers
- •Definitions
- •Counter Unit
- •Output Compare Unit
- •Force Output Compare
- •Modes of Operation
- •Normal Mode
- •Fast PWM Mode
- •Phase Correct PWM Mode
- •Internal Clock Source
- •Prescaler Reset
- •External Clock Source
- •16-bit Timer/Counter1
- •Overview
- •Registers
- •Definitions
- •Compatibility
- •Counter Unit
- •Input Capture Unit
- •Input Capture Trigger Source
- •Noise Canceler
- •Using the Input Capture Unit
- •Output Compare Units
- •Force Output Compare
- •Modes of Operation
- •Normal Mode
- •Fast PWM Mode
- •Phase Correct PWM Mode
- •8-bit Timer/Counter2 with PWM and Asynchronous Operation
- •Overview
- •Registers
- •Definitions
- •Counter Unit
- •Output Compare Unit
- •Force Output Compare
- •Modes of Operation
- •Normal Mode
- •Fast PWM Mode
- •Phase Correct PWM Mode
- •Timer/Counter Prescaler
- •Slave Mode
- •Master Mode
- •Data Modes
- •USART
- •Overview
- •Clock Generation
- •External Clock
- •Synchronous Clock Operation
- •Frame Formats
- •Parity Bit Calculation
- •USART Initialization
- •Sending Frames with 5 to 8 Data Bits
- •Sending Frames with 9 Data Bits
- •Parity Generator
- •Disabling the Transmitter
- •Receiving Frames with 5 to 8 Data Bits
- •Receiving Frames with 9 Data Bits
- •Receiver Error Flags
- •Parity Checker
- •Disabling the Receiver
- •Flushing the Receive Buffer
- •Asynchronous Data Recovery
- •Using MPCM
- •Write Access
- •Read Access
- •Two-wire Serial Interface
- •Features
- •TWI Terminology
- •Electrical Interconnection
- •Transferring Bits
- •START and STOP Conditions
- •Address Packet Format
- •Data Packet Format
- •Overview of the TWI Module
- •SCL and SDA Pins
- •Bit Rate Generator Unit
- •Bus Interface Unit
- •Address Match Unit
- •Control Unit
- •TWI Register Description
- •Using the TWI
- •Transmission Modes
- •Master Transmitter Mode
- •Master Receiver Mode
- •Slave Receiver Mode
- •Slave Transmitter Mode
- •Miscellaneous States
- •Analog Comparator
- •Analog Comparator Multiplexed Input
- •Features
- •Operation
- •Starting a Conversion
- •Differential Gain Channels
- •Changing Channel or Reference Selection
- •ADC Input Channels
- •ADC Voltage Reference
- •ADC Noise Canceler
- •Analog Input Circuitry
- •ADC Accuracy Definitions
- •ADC Conversion Result
- •ADLAR = 0
- •ADLAR = 1
- •Boot Loader Features
- •Application Section
- •Boot Loader Lock Bits
- •Performing a Page Write
- •Using the SPM Interrupt
- •Setting the Boot Loader Lock Bits by SPM
- •Reading the Fuse and Lock Bits from Software
- •Preventing Flash Corruption
- •Simple Assembly Code Example for a Boot Loader
- •Fuse Bits
- •Latching of Fuses
- •Signature Bytes
- •Calibration Byte
- •Signal Names
- •Parallel Programming
- •Enter Programming Mode
- •Chip Erase
- •Programming the Flash
- •Programming the EEPROM
- •Reading the Flash
- •Reading the EEPROM
- •Programming the Lock Bits
- •Reading the Signature Bytes
- •Reading the Calibration Byte
- •Serial Downloading
- •Data Polling Flash
- •Data Polling EEPROM
- •Electrical Characteristics
- •Absolute Maximum Ratings*
- •DC Characteristics
- •External Clock Drive Waveforms
- •External Clock Drive
- •Two-wire Serial Interface Characteristics
- •ADC Characteristics
- •Active Supply Current
- •Idle Supply Current
- •Standby Supply Current
- •Pin Pullup
- •Pin Driver Strength
- •Internal Oscillator Speed
- •Register Summary
- •Instruction Set Summary
- •Ordering Information
- •Packaging Information
- •Errata
- •Changes from Rev. 2502E-12/03 to Rev. 2502G-06/04
- •Changes from Rev. 2502E-12/03 to Rev. 2502F-06/04
- •Changes from Rev. 2502D-09/03 to Rev. 2502E-12/03
- •Changes from Rev. 2502C-04/03 to Rev. 2502D-09/03
- •Changes from Rev. 2502B-09/02 to Rev. 2502C-04/03
- •Changes from Rev. 2502A-06/02 to Rev. 2502B-09/02
- •Table of Contents
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ATmega8535(L) |
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Pin Pullup |
Figure 155. I/O Pin Pull-up Resistor Current vs. Input Voltage (VCC = 5V) |
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I/O PIN PULL-UP RESISTOR CURRENT vs. INPUT VOLTAGE |
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IOP (uA)
Vcc = 5V
160 |
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140 |
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25°C |
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85°C |
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120
-40°C
100
80
60
40
20
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1 |
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3 |
VOP (V)
Figure 156. I/O Pin Pull-up Resistor Current vs. Input Voltage (VCC = 2.7V)
I/O PIN PULL-UP RESISTOR CURRENT vs. INPUT VOLTAGE
Vcc = 2.7V
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80 |
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85°C |
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70 |
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25°C |
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60 |
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-40°C |
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(uA) |
50 |
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40 |
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OP |
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I |
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30 |
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20 |
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10 |
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0 |
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0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
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VOP (V)
279
2502K–AVR–10/06
Figure 157. Reset Pull-up Resistor Current vs. Reset Pin Voltage (VCC = 5V)
RESET PULL-UP RESISTOR CURRENT vs. RESET PIN VOLTAGE
Vcc = 5V
120
-40°C 
25°C
100
85°C
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80 |
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(uA) |
60 |
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RESET |
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I |
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40 |
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20 |
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0 |
0 |
1 |
2 |
3 |
VRESET (V)
Figure 158. Reset Pull-up Resistor Current vs. Reset Pin Voltage (VCC = 2.7V)
RESET PULL-UP RESISTOR CURRENT vs. RESET PIN VOLTAGE
Vcc = 2.7V
60
-40°C 
25°C
50
85°C
40
(uA) |
30 |
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RESET |
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20
10
0
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
VRESET (V)
280 ATmega8535(L)
2502K–AVR–10/06
ATmega8535(L)
Pin Driver Strength |
Figure 159. I/O Pin Source Current vs. Output Voltage (VCC = 5V) |
IOH (mA)
I/O PIN SOURCE CURRENT vs. OUTPUT VOLTAGE
Vcc = 5V
90
80
-40°C
70
25°C
60
85°C
50
40
30
20
10
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VOH (V)
Figure 160. I/O Pin Source Current vs. Output Voltage (VCC = 2.7V)
IOH (mA)
I/O PIN SOURCE CURRENT vs. OUTPUT VOLTAGE
Vcc = 2.7V
30
-40°C
25
25°C
85°C
20
15
10
5
0
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
VOH (V)
281
2502K–AVR–10/06
Figure 161. I/O Pin Sink Current vs. Output Voltage (VCC = 5V)
IOL (mA)
I/O PIN SINK CURRENT vs. OUTPUT VOLTAGE
Vcc = 5V
90
80
-40°C
70
25°C
60
85°C
50
40
30
20
10
0
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
VOL (V)
Figure 162. I/O Pin Sink Current vs. Output Voltage (VCC = 2.7V)
IOL (mA)
I/O PIN SINK CURRENT vs. OUTPUT VOLTAGE
Vcc = 2.7V
35
-40°C
30
25°C
25
85°C
20
15
10
5
0
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
VOL (V)
282 ATmega8535(L)
2502K–AVR–10/06
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ATmega8535(L) |
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Pin Thresholds And |
Figure 163. I/O Pin Input Threshold Voltage vs. VCC (VIH, I/O Pin Read As '1') |
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Hysteresis |
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Threshold (V)
I/O PIN INPUT THRESHOLD VOLTAGE vs. VCC
VIH, IO PIN READ AS '1'
2.5
-40°C
2
85°C
25°C
1.5
1
0.5
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
Figure 164. I/O Pin Input Threshold Voltage vs. VCC (VIL, I/O Pin Read As '0')
Threshold (V)
I/O PIN INPUT THRESHOLD VOLTAGE vs. VCC
VIL, IO PIN READ AS '0'
2
1.5 |
-40°C |
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25°C |
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85°C |
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0.5
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
283
2502K–AVR–10/06
Figure 165. I/O Pin Input Hysteresis vs. VCC
Threshold (V)
I/O PIN INPUT HYSTERESIS vs. VCC
0.7
0.6
85°C 
25°C 
-40°C
0.5
0.4
0.3
0.2
0.1
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
Figure 166. Reset Input Threshold Voltage vs. VCC (VIH, Reset Pin Read As '1')
Threshold (V)
RESET INPUT THRESHOLD VOLTAGE vs. VCC
VIH, IO PIN READ AS '1'
2.5
2
-40°C
1.5
25°C
85°C
1
0.5
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
284 ATmega8535(L)
2502K–AVR–10/06
ATmega8535(L)
Figure 167. Reset Input Threshold Voltage vs. VCC (VIL, Reset Pin Read As '0')
Threshold (V)
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RESET INPUT THRESHOLD VOLTAGE vs. VCC |
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VIL, IO PIN READ AS '0' |
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3 |
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2.5 |
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85°C |
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-40°C |
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25°C |
2 |
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1.5
1
0.5
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
Figure 168. Reset Input Pin Hysteresis vs. VCC
RESET INPUT PIN HYSTERESIS vs. VCC
Threshold (V)
0.6
-40°C
0.5
0.4
25°C
0.3
0.285°C
0.1
0
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
VCC (V)
285
2502K–AVR–10/06
BOD Thresholds And Analog Figure 169. BOD Thresholds vs. Temperature (BOD Level is 4.0V)
Comparator Offset
Threshold (V)
BOD THRESHOLDS vs. TEMPERATURE
BOD LEVEL IS 4.0 V
4
Rising VCC
3.95
3.9
3.85
3.8
Falling VCC
3.75
3.7
-50 -40 -30 -20 -10 |
0 |
10 20 30 40 50 60 70 80 90 100 |
Temperature (C)
Figure 170. BOD Thresholds vs. Temperature (BOD Level is 2.7V)
Threshold (V)
BOD THRESHOLDS vs. TEMPERATURE
BOD LEVEL IS 2.7 V
2.85
2.8
Rising VCC
2.75
2.7
2.65
Falling VCC
2.6
2.55
2.5
-50 -40 -30 -20 -10 |
0 |
10 20 30 40 50 60 70 80 90 100 |
Temperature (C)
286 ATmega8535(L)
2502K–AVR–10/06
ATmega8535(L)
Figure 171. Bandgap Voltage vs. VCC
BANDGAP vs. VCC
Bandgap Voltage (V)
1.226 |
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-40°C |
1.224 |
25°C |
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1.222 |
85°C |
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1.22
1.218
1.216
1.214
1.212
1.21
1.208
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
Vcc (V)
Figure 172. Analog Comparator Offset Voltage vs. Common Mode Voltage (VCC = 5V)
ANALOG COMPARATOR OFFSET VOLTAGE
Vcc = 5V
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0.002 |
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0.001 |
(V) |
0 |
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Voltage |
-0.001 |
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Offset |
-0.002 |
Comparator |
-0.003 |
-0.004
-0.005
-0.006
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
vs. COMMON MODE VOLTAGE
25°C
85°C
-40°C
3.5 |
4 |
4.5 |
5 |
Common Mode Voltage (V)
287
2502K–AVR–10/06