HT49R50 Holtek Semiconductor Inc, HT49R50 Datasheet - Page 46

• Manufacturer Part Number: HT49R50
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

SBC A,[m]
Description
Operation
Affected flag(s)
SBCM A,[m]
Description
Operation
Affected flag(s)
SDZ [m]
Description
Operation
Affected flag(s)
SDZA [m]
Description
Operation
Affected flag(s)
Subtract data memory and carry from the accumulator
The contents of the specified data memory and the complement of the carry flag
aresubtractedfromtheaccumulator,leaving the result in theaccumulator.
ACC ¬ ACC+[m]+C
Subtract data memory and carry from the accumulator
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.
[m] ¬ ACC+[m]+C
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. 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).
Skip if ([m]-1)=0, [m] ¬ ([m]-1)
Decrement data memory and 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 the proper instruction (two
cycles). Otherwise proceed with the next instruction (one cycle).
Skip if ([m]-1)=0, ACC ¬ ([m]-1)
TC2
TC2
TC2
TC2
¾
¾
¾
¾
TC1
TC1
TC1
TC1
¾
¾
¾
¾
TO
TO
TO
TO
¾
¾
¾
¾
PD
PD
PD
PD
¾
¾
¾
¾
46
OV
OV
OV
OV
¾
¾
Ö
Ö
¾
¾
Z
Ö
Z
Ö
Z
Z
AC
AC
AC
AC
¾
¾
Ö
Ö
¾
¾
C
C
C
C
Ö
Ö
August 18, 1999
HT49C50