STM8 addressing modes |
PM0044 |
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6.8Indirect Indexed (Short Pointer Long, Long Pointer Long, Long Pointer Extended) addressing mode
Table 31. |
Overview of Indirect indexed instructions |
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Addressing mode |
Syntax |
EA formula |
Ptr Adr |
Ptr Size |
Dest adr |
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Short Pointer |
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Indirect |
Indexed |
([shortptr.w],ndx) |
((shortptr.w) + ndx) |
00..FF |
Word |
000000.01FFFE |
Long |
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Long Pointer |
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Indirect |
Indexed |
([longptr.w],ndx) |
([longptr.w] +ndx) |
00..FFFF |
Word |
000000.01FFFE |
Long |
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Long Pointer |
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Indirect |
Indexed |
([longptr.e],ndx) |
([longptr.e] +ndx) |
00..FFFF |
Extword |
000000.FFFFFE |
Extended |
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This is a combination of indirect and indexed addressing mode. The data byte required for the operation is found by its memory address, which is defined by the unsigned addition of an index register value (X or Y) with a pointer value located in memory. The pointer address follows the op-code.
The indirect indexed addressing mode is made of four sub-modes:
Table 32. |
Available Long Pointer Long and Short Pointer Long Indirect |
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Indexed instructions |
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Instructions |
Functions |
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LD, LDW |
Load |
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CP |
Compare |
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AND, OR, XOR |
Logical Operations |
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ADC, ADD, SUB, SBC |
Arithmetic Addition/Subtraction operations |
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BCP |
Bit Compare |
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CALL, JP |
Call or Jump subroutine |
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Table 33. |
Available Long Pointer Long Indirect Indexed instructions |
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Instructions |
Functions |
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CLR |
Clear |
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TNZ |
Test Negative or Zero |
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CPL, NEG |
1’s or 2’s Complement |
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SLA,SLL, SRL, SRA, RLC, RRC |
Shift and Rotate Operations |
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SWAP |
Swap Nibbles |
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INC, DEC |
Increment/Decrement |
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Table 34. |
Long Pointer Extended Indirect Indexed instructions instruction |
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Instructions |
Functions |
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LDF |
Far load |
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48/162 |
Doc ID 13590 Rev 3 |