Chapter 9 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
418 Freescale Semiconductor
Operation
RS1[(o+w):o] RD[w:0]; 0 RD[15:(w+1)]
w= (RS2[7:4])
o = (RS2[3:0])
Extracts w+1 bits from register RS1 starting at position oand writes them right aligned into register RD.
The remaining bits in RD will be cleared. If (o+w) > 15 only bits [15:o] get extracted.
CCR Effects
Code and CPU Cycles
BFEXT Bit Field Extract BFEXT
NZVC
00
N: Set if bit 15 of the result is set; cleared otherwise.
Z: Set if the result is $0000; cleared otherwise.
V: 0; cleared.
C: Not affected.
Source Form Address
Mode Machine Code Cycles
BFEXT RD, RS1, RS2 TRI 0 1 1 0 0 RD RS1 RS2 1 1 P
W4 O4
15 025
W4=3, O4=2
15 03
Bit Field Extract
RS2
RS1
RD0
15 0374