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Файл:mikrocont / LC7985NA.pdf
Источник:
LC7985NA, LC7985ND
Microcontroller Interface
8-bit interface
DB0 to DB7 are used for the 8-bit data bus. The timing sequence for instruction write, instruction execution, and busy flag checking is shown in the following figure.
4-bit interface
The timing sequence for instruction write, instruction execution and busy flag checking is shown in the following figure. The busy flag is checked after transferring two 4-bit sets of data. The busy flag and address counter value are
output as two 4-bit words. Checking the busy flag, therefore, requires two read cycles so the low-order four bits of the address counter value are flushed from the data buffer.
Note. IR7 and IR3 are the 7th and 3rd bit, respectively, of the instruction. AC3 is the 3rd bit of the address counter.
No. 3255—20/30