mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 658
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mc9s12xf512
Manufacturer Part Number
mc9s12xf512
Description
S12x Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XF512.pdf
(1306 pages)
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Chapter 14 XGATE (S12XGATEV3)
ASR
Operation
n = RS or IMM4
Shifts the bits in register RD n positions to the right. The higher n bits of the register RD become filled
with the sign bit (RD[15]). The carry flag will be updated to the bit contained in RD[n-1] before the shift
for n > 0.
n can range from 0 to 16.
In immediate address mode, n is determined by the operand IMM4. n is considered to be 16 if IMM4 is
equal to 0.
In dyadic address mode, n is determined by the content of RS. n is considered to be 16 if the content of RS
is greater than 15.
CCR Effects
Code and CPU Cycles
658
N:
Z:
V:
C:
ASR RD, #IMM4
ASR RD, RS
N
∆
Set if bit 15 of the result is set; cleared otherwise.
Set if the result is $0000; cleared otherwise.
Set if a two´s complement overflow resulted from the operation; cleared otherwise.
RD[15]
Set if n > 0 and RD[n-1] = 1; if n = 0 unaffected.
Z
∆
old
V
∆
Source Form
^ RD[15]
C
∆
new
MC9S12XF - Family Reference Manual, Rev.1.19
Address
b15
Mode
IMM4
DYA
Arithmetic Shift Right
0
0
0
0
RD
n
0
0
0
0
1
1
Machine Code
RD
RD
C
RS
IMM4
1
1
0
Freescale Semiconductor
0
0
ASR
0
0
1
1
Cycles
P
P
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