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PC912XDP512F0CALR Datasheet(PDF) 228 Page - Freescale Semiconductor, Inc

Part # PC912XDP512F0CALR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC912XDP512F0CALR Datasheet(HTML) 228 Page - Freescale Semiconductor, Inc

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Chapter 6 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
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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