HT48R30A datasheet(39/43 Pages) HOLTEK

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SIZA [m]

Increment data memory and place result in ACC, skip if 0

Description

The contents of the specified data memory are incremented by 1. If the result

is 0, the next instruction is skipped and the result is stored in the accumula-

tor. The data memory remains unchanged. If the result is 0, the following in-

struction, fetched during the current instruction execution, is discarded and

a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise

proceed with the next instruction (1 cycle).

Operation

Skip if ([m]+1)=0, ACC ¬ ([m]+1)

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SNZ [m].i

Skip if bit "i" of the data memory is not 0

Description

If bit "i" of the specified data memory is not 0, the next instruction is skipped.

If bit "i" of the data memory is not 0, the following instruction, fetched during

the current instruction execution, is discarded and a dummy cycle is re-

placed to get the proper instruction (2 cycles). Otherwise proceed with the

next instruction (1 cycle).

Operation

Skip if [m].i¹0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SUB A,[m]

Subtract data memory from the accumulator

Description

The specified data memory is subtracted from the contents of the accumula-

tor, leaving the result in the accumulator.

Operation

ACC ¬ ACC+[m]+1

Affected flag(s)

TC2 TC1

ÖÖÖÖ

SUBM A,[m]

Subtract data memory from the accumulator

Description

The specified data memory is subtracted from the contents of the accumula-

tor, leaving the result in the data memory.

Operation

[m] ¬ ACC+[m]+1

Affected flag(s)

TC2 TC1

ÖÖÖÖ

HT48R30A-1

Rev. 1.10

July 2, 2001

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