TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 113
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TSC80251
Manufacturer Part Number
TSC80251
Description
Manufacturer
TEMIC [TEMIC Semiconductors]
Datasheet
1.TSC80251.pdf
(219 pages)
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TSC80251
DEC byte
Function:
Decrement
Description:
Decrements the specified byte variable by 1. An original value of 00h underflows to 0FFh. Four operands addressing
modes are allowed: accumulator, register, direct or register–indirect.
Note :
When this instruction is used to modify an output Port, the value used as the original Port data is read from the output data latch, not the input
pins.
Example :
Register 0 contains 7Fh (01111111B). On–chip RAM locations 7Eh and 7Fh contain 00h and 40h, respectively. After
executing the instruction sequence:
register 0 contains 7Eh and on–chip RAM locations 7Eh and 7Fh are set to 0FFh and 3Fh, respectively.
DEC A
[Encoding]
DEC dir8
[Encoding]
5.68
FLAGS :
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
Hex Code in:
Binary Mode = [Encoding]
Source Mode = [Encoding]
0001
0001
DEC @R0
DEC R0
DEC @R0
CY
_
0100
0101
AC
_
addr7-addr0
OV
_
Operation:
DEC
(A)
Operation:
DEC
(dir8)
(A) - 1
(dir8) - 1
N
Rev. C – May 7, 1999
Z