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SC312XDP512F0MPVR датащи(PDF) 228 Page - Freescale Semiconductor, Inc

номер детали SC312XDP512F0MPVR
подробное описание детали  Covers, S12XD, S12XB & S12XA Families
PDF  1350 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

SC312XDP512F0MPVR датащи(HTML) 228 Page - Freescale Semiconductor, Inc

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Chapter 6 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
228
Freescale Semiconductor
Operation
FirstOne (RS)
⇒ RD;
Searches the first “1” in register RS (from MSB to LSB) and writes the bit position into the destination
register RD. The upper bits of RD are cleared. In case the content of RS is equal to $0000, RD will be
cleared and the carry flag will be set. This is used to distinguish a “1” in position 0 versus no “1” in the
whole RS register at all.
CCR Effects
Code and CPU Cycles
BFFO
Bit Field Find First One
BFFO
NZ
V
C
0
0
N:
0; cleared.
Z:
Set if the result is $0000; cleared otherwise.
V:
0; cleared.
C:
Set if RS = $00001; cleared otherwise.
1 Before executing the instruction
Source Form
Address
Mode
Machine Code
Cycles
BFFO RD, RS
DYA
0
0
0
0
1
RD
RS
1
0
0
0
0
P



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