HT47C20 Holtek Semiconductor Inc, HT47C20 Datasheet - Page 50

• Manufacturer Part Number: HT47C20
• 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)
Subtract data memory and carry from accumulator
The contents of the specified data memory and the complement of the
carry flag are together subtracted from the accumulator, leaving the re-
sult in the accumulator.
ACC ¬ ACC+[m]+C
Subtract data memory and carry from accumulator
The contents of the specified data memory and the complement of the
carry flag are together subtracted from the accumulator, leaving the re-
sult 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
result is zero, the next instruction is skipped. If the result is zero, the fol-
lowing instruction, fetched during the current instruction execution, is
discarded and a dummy cycle replaced to get the proper instruction. This
makes a 2-cycle instruction. Otherwise proceed with the next instruc-
tion.
Skip if ([m]-1)=0, [m] ¬ ([m]-1)
TC2
TC2
TC2
¾
¾
¾
TC1
TC1
TC1
¾
¾
¾
TO
TO
TO
¾
¾
¾
50
PD
PD
PD
¾
¾
¾
OV
OV
OV
¾
Ö
Ö
¾
Z
Z
Ö
Ö
Z
AC
AC
AC
¾
Ö
Ö
¾
C
C
C
Ö
Ö
January 18, 2000
HT47C20