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HCS12 датащи(PDF) 166 Page - Freescale Semiconductor, Inc

номер детали HCS12
подробное описание детали  HCS12 Microcontrollers
PDF  452 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

HCS12 датащи(HTML) 166 Page - Freescale Semiconductor, Inc

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Instruction Glossary
S12CPUV2 Reference Manual, Rev. 4.0
166
Freescale Semiconductor
Operation:
(B) – $01
⇒ B
Description:
Subtract one from the content of accumulator B.
The N, Z, and V status bits are set or cleared according to the results of the
operation. The C status bit is not affected by the operation, thus allowing the
DEC instruction to be used as a loop counter in multiple-precision
computations.
DECB
Decrement B
DECB
CCR Details:
S
X
HIN
Z
V
C
––––
∆∆∆
N: Set if MSB of result is set; cleared otherwise
Z: Set if result is $00; cleared otherwise
V: Set if there was a two’s complement overflow as a result of the
operation; cleared otherwise. Two’s complement overflow occurs if
and only if (B) was $80 before the operation.
Source Form
Address
Mode
Object Code
Access Detail
HCS12
M68HC12
DECB
INH
53
O
O



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