HT48C10 datasheet(43/59 Pages) HOLTEK

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SBC A,[m]

Subtract data memory and carry from the accumulator

Description

The contents of the specified data memory and the complement of the carry

flag are subtracted from the accumulator, leaving the result in the accumu-

lator.

Operation

ACC

← ACC+[m]+C

Affected flag(s)

TC2

TC1

–––

–

√√

SBCM A,[m]

Subtract data memory and carry from the accumulator

Description

The contents of the specified data memory and the complement of the carry

flag are subtracted from the accumulator, leaving the result in the data

memory.

Operation

[m]

← ACC+[m]+C

Affected flag(s)

TC2

TC1

–––

–

√√

SDZ [m]

Skip if decrement data memory is zero

Description

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

result is zero, the next instruction is skipped. If the result is zero, the

following instruction, fetched during the current instruction execution, is

discarded and a dummy cycle is replaced to get the proper instruction (two

cycles). Otherwise proceed with the next instruction (one cycle).

Operation

Skip if ([m]–1)=0, [m]

← ([m]–1)

Affected flag(s)

TC2

TC1

–

––

–––

SDZA [m]

Decrement data memory and place result in ACC, skip if zero

Description

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

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

accumulator 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 the proper instruction (two

cycles). Otherwise proceed with the next instruction (one cycle).

Operation

Skip if ([m]–1)=0, ACC

← ([m]–1)

Affected flag(s)

TC2

TC1

–

––

–––

HT48CXX/HT48RXX

25th May ’99

HT48C10 Scheda tecnica(PDF) 43 Page - Holtek Semiconductor Inc

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