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HCS12 데이터시트(PDF) 163 Page - Freescale Semiconductor, Inc

부품명 HCS12
상세설명  HCS12 Microcontrollers
PDF  452 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
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HCS12 데이터시트(HTML) 163 Page - Freescale Semiconductor, Inc

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Glossary
S12CPUV2 Reference Manual, Rev. 4.0
Freescale Semiconductor
163
Operation:
(Counter) – 1
⇒ Counter
If (Counter) not = 0, then (PC) + $0003 + Rel
⇒ PC
Description:
Subtract one from the specified counter register A, B, D, X, Y, or SP. If the
counter register has not been decremented to zero, execute a branch to the
specified relative destination. The DBNE instruction is encoded into three
bytes of machine code including a 9-bit relative offset (–256 to
+255
locations from the start of the next instruction).
IBNE and TBNE instructions are similar to DBNE except that the counter is
incremented or tested rather than being decremented. Bits 7 and 6 of the
instruction postbyte are used to determine which operation is to be
performed.
DBNE Decrement and Branch if Not Equal to Zero DBNE
CCR Details:
S
X
HIN
Z
V
C
––––––––
Source Form
Address
Mode
Object Code(1)
1. Encoding for lb is summarized in the following table. Bit 3 is not used (don’t care), bit 5 selects branch on zero (DBEQ – 0)
or not zero (DBNE – 1) versions, and bit 4 is the sign bit of the 9-bit relative offset. Bits 7 and 6 would be 0:0 for DBNE.
Access Detail
HCS12
M68HC12
DBNE abdxys, rel9
REL
04 lb rr
PPP/PPO
PPP
Count
Register
Bits 2:0
Source Form
Object Code
(If Offset is Positive)
Object Code
(If Offset is Negative)
A
B
000
001
DBNE A, rel9
DBNE B, rel9
04 20 rr
04 21 rr
04 30 rr
04 31 rr
D
X
Y
SP
100
101
110
111
DBNE D, rel9
DBNE X, rel9
DBNE Y, rel9
DBNE SP, rel9
04 24 rr
04 25 rr
04 26 rr
04 27 rr
04 34 rr
04 35 rr
04 36 rr
04 37 rr



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