ht82k68a Holtek Semiconductor Inc., ht82k68a Datasheet - Page 27

• Manufacturer Part Number: ht82k68a
• Description: Ht82k68a -- Multimedia Keyboard Encoder 8-bit Mask Mcu
• Manufacturer: Holtek Semiconductor Inc.

RRCA [m]
Description
Operation
Affected flag(s)
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)
Rev. 1.70
Rotate right through carry and place result in the accumulator
Data of the specified data memory and the carry flag are rotated 1 bit right. Bit 0 replaces
the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is
stored in the accumulator. The contents of the data memory remain unchanged.
ACC.i
ACC.7
C
Subtract data memory and carry from the accumulator
The contents of the specified data memory and the complement of the carry flag are sub-
tracted from the accumulator, leaving the result in the accumulator.
ACC
Subtract data memory and carry from the accumulator
The contents of the specified data memory and the complement of the carry flag are sub-
tracted from the accumulator, leaving the result in the data memory.
[m]
Skip if decrement data memory is 0
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. If the result is 0, the following instruction, fetched during the current
instruction execution, is discarded and a dummy cycle is replaced to get the proper instruc-
tion (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Skip if ([m] 1)=0, [m]
Decrement data memory and place result in ACC, skip if 0
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. The result is stored in the accumulator but the data memory remains
unchanged. If the result is 0, the following instruction, fetched during the current instruction
execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cy-
cles). Otherwise proceed with the next instruction (1 cycle).
Skip if ([m] 1)=0, ACC
TO
TO
TO
TO
TO
[m].0
ACC+[m]+C
ACC+[m]+C
[m].(i+1); [m].i:bit i of the data memory (i=0~6)
C
PDF
PDF
PDF
PDF
PDF
OV
OV
OV
OV
OV
([m] 1)
([m] 1)
27
Z
Z
Z
Z
Z
AC
AC
AC
AC
AC
C
C
C
C
C
December 26, 2005
HT82K68A