HT827A0 データシートの表示（PDF） - Holtek Semiconductor

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HT827A0

8-Bit Microcontroller with Voice ROM

Holtek Semiconductor 

SDZ [m]

Description

Operation

Affected flag(s)

SDZA [m]

Description

Operation

Affected flag(s)

SET [m]

Description

Operation

Affected flag(s)

SET [m].i

Description

Operation

Affected flag(s)

HT827A0

Skip if decrement data memory is zero

The contents of the specified data memory are decremented by one. If the re-

sult is zero, the next instruction is skipped and the following instruction,

fetched during the current instruction execution, is discarded and a dummy

cycle is replaced to get a proper instruction. This makes a 2-cycle instruction.

Otherwise proceed to the next instruction.

Skip if ([m]-1)=0, [m] ¬ ([m]-1)

TC2 TC1 TO PD OV Z AC C

¾¾ ¾ ¾ ¾ ¾ ¾ ¾

Decrement data memory - then place result in ACC, skip if zero

The contents of the specified data memory are decremented by one. If the re-

sult is zero, the next instruction is skipped. The result is stored in the accu-

mulator but the data memory remains unchanged. If the result is zero, the

following instruction, fetched during the current instruction execution, is

discarded and a dummy cycle is replaced to get a proper instruction, making

a 2-cycle instruction. Otherwise proceed to the next instruction.

Skip if ([m]-1)=0, ACC ¬ ([m]-1)

TC2 TC1 TO PD OV Z AC C

¾¾ ¾ ¾ ¾ ¾ ¾ ¾

Set data memory

Each bit of the specified data memory is set to 1

[m] ¬ FFH

TC2 TC1 TO PD OV Z AC C

¾¾ ¾ ¾ ¾ ¾ ¾ ¾

Set bit of data memory

Bit ²i² of the specified data memory is set to 1.

[m].i ¬ 1

TC2 TC1 TO PD OV Z AC C

¾¾ ¾ ¾ ¾ ¾ ¾ ¾

43

March 15, 2000

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