參數(shù)資料
型號(hào)： HT49R50
廠商： Holtek Semiconductor Inc.
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 46/59頁(yè)
文件大?。?/td> 339K
代理商： HT49R50
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
flagaresubtractedfromtheaccumulator,leavingtheresultintheaccumula-
tor.
Operation
ACC
ACC+[m]+C
Affected flag(s)
TC2
TC1
TO
PD
OV
Z
AC
C
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
TO
PD
OV
Z
AC
C
SDZ [m]
Skip if decrement data memory is zero
Description
The contents of the specified data memory are decremented by one. If the re-
sult 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). Oth-
erwise proceed with the next instruction (one cycle).
Operation
Skip if ([m] 1)=0, [m]
([m] 1)
Affected flag(s)
TC2
TC1
TO
PD
OV
Z
AC
C
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 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 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
TO
PD
OV
Z
AC
C
HT49R50
46
October 22, 1999
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