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HCS12 Datasheet(PDF) 167 Page - Freescale Semiconductor, Inc

Part # HCS12
Description  HCS12 Microcontrollers
PDF  452 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

HCS12 Datasheet(HTML) 167 Page - Freescale Semiconductor, Inc

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Glossary
S12CPUV2 Reference Manual, Rev. 4.0
Freescale Semiconductor
167
Operation:
(SP) – $0001
⇒ SP
Description:
Subtract one from the SP. This instruction assembles to LEAS –1,SP. The
LEAS instruction does not affect condition codes as DEX or DEY
instructions do.
DES
Decrement Stack Pointer
DES
CCR Details:
S
X
HIN
Z
V
C
––––––––
Source Form
Address
Mode
Object Code
Access Detail
HCS12
M68HC12
DES
translates to... LEAS –1,SP
IDX
1B 9F
Pf
PP
(1)
1. Due to internal M68HC12 CPU requirements, the program word fetch is performed twice to the same address during this
instruction.



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