HT82K68 Holtek Semiconductor Inc, HT82K68 Datasheet - Page 37

• Manufacturer Part Number: HT82K68
• Description: Multimedia Keyboard Encoder OTP
• Manufacturer: Holtek Semiconductor Inc

SWAP [m]
Description
Operation
Affected flag(s)
SWAPA [m]
Description
Operation
Affected flag(s)
SZ [m]
Description
Operation
Affected flag(s)
SZA [m]
Description
Operation
Affected flag(s)
Swap nibbles within the data memory
The low-order and high-order nibbles of the specified data memory (one of
the data memories) are interchanged.
[m].3~[m].0 « [m].7~[m].4
Swap data memory-place result in the accumulator
The low-order and high-order nibbles of the specified data memory are inter-
changed, writing the result to the accumulator. The contents of the data
memory remain unchanged.
ACC.3~ACC.0 ¬ [m].7~[m].4
ACC.7~ACC.4 ¬ [m].3~[m].0
Skip if data memory is 0
If the contents of the specified data memory are 0, the following instruction,
fetched during the current instruction execution, is discarded and a dummy
cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed
with the next instruction (2 cycle).
Skip if [m]=0
Move data memory to ACC, skip if 0
The contents of the specified data memory are copied to the accumulator. If
the contents is 0, the following instruction, fetched during the current in-
struction execution, is discarded and a dummy cycle is replaced to get the
proper instruction (2 cycles). Otherwise proceed with the next instruction (1
cycle).
Skip if [m]=0, ACC ¬ [m]
TC2
TC2
TC2
TC2
¾
¾
¾
¾
TC1
TC1
TC1
TC1
¾
¾
¾
¾
TO
TO
TO
TO
¾
¾
¾
¾
Preliminary
PD
PD
PD
PD
¾
¾
¾
¾
37
OV
OV
OV
OV
¾
¾
¾
¾
¾
¾
¾
¾
Z
Z
Z
Z
AC
AC
AC
AC
¾
¾
¾
¾
¾
¾
¾
¾
C
C
C
C
HT82K68E
August 8, 2000