Central Processor Unit (CPU)
Table 7-1. Instruction Set Summary (Sheet 2 of 7)
Effect
Source
Form
on CCR
Operation
Description
V H I N Z C
Branch if Greater Than or Equal To
(Signed Operands)
BGE opr
–
–
–
–
–
–
–
–
–
–
– REL
– REL
90 rr
92 rr
3
PC ← (PC) + 2 + rel ? (N V) = 0
Branch if Greater Than (Signed
Operands)
BGT opr
3
3
PC ← (PC) + 2 + rel ? (Z) | (N V) = 0
BHCC rel
BHCS rel
BHI rel
Branch if Half Carry Bit Clear
Branch if Half Carry Bit Set
Branch if Higher
PC ← (PC) + 2 + rel ? (H) = 0
PC ← (PC) + 2 + rel ? (H) = 1
PC ← (PC) + 2 + rel ? (C) | (Z) = 0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– REL
– REL
– REL
28 rr
29 rr
22 rr
3
3
3
Branch if Higher or Same
(Same as BCC)
BHS rel
PC ← (PC) + 2 + rel ? (C) = 0
–
–
–
–
–
– REL
24 rr
BIH rel
BIL rel
Branch if IRQ Pin High
Branch if IRQ Pin Low
PC ← (PC) + 2 + rel ? IRQ = 1
PC ← (PC) + 2 + rel ? IRQ = 0
–
–
–
–
–
–
–
–
–
–
– REL
– REL
2F rr
2E rr
3
3
BIT #opr
BIT opr
IMM
DIR
EXT
A5 ii
B5 dd
C5 hh ll
D5 ee ff
E5 ff
2
3
4
4
3
2
4
5
BIT opr
BIT opr,X
BIT opr,X
BIT ,X
BIT opr,SP
BIT opr,SP
IX2
Bit Test
(A) & (M)
0
–
–
ꢀ
ꢀ
–
IX1
IX
SP1
SP2
F5
9EE5 ff
9ED5 ee ff
Branch if Less Than or Equal To
(Signed Operands)
BLE opr
–
–
–
–
–
– REL
93 rr
3
PC ← (PC) + 2 + rel ? (Z) | (N V) = 1
BLO rel
BLS rel
BLT opr
BMC rel
BMI rel
BMS rel
BNE rel
BPL rel
BRA rel
Branch if Lower (Same as BCS)
Branch if Lower or Same
Branch if Less Than (Signed Operands)
Branch if Interrupt Mask Clear
Branch if Minus
PC ← (PC) + 2 + rel ? (C) = 1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– REL
– REL
– REL
– REL
– REL
– REL
– REL
– REL
– REL
25 rr
23 rr
91 rr
2C rr
2B rr
2D rr
26 rr
2A rr
20 rr
3
3
3
3
3
3
3
3
3
PC ← (PC) + 2 + rel ? (C) | (Z) = 1
PC ← (PC) + 2 + rel ? (N V) =1
PC ← (PC) + 2 + rel ? (I) = 0
PC ← (PC) + 2 + rel ? (N) = 1
PC ← (PC) + 2 + rel ? (I) = 1
PC ← (PC) + 2 + rel ? (Z) = 0
PC ← (PC) + 2 + rel ? (N) = 0
PC ← (PC) + 2 + rel
Branch if Interrupt Mask Set
Branch if Not Equal
Branch if Plus
Branch Always
DIR (b0) 01 dd rr
DIR (b1) 03 dd rr
DIR (b2) 05 dd rr
DIR (b3) 07 dd rr
DIR (b4) 09 dd rr
DIR (b5) 0B dd rr
DIR (b6) 0D dd rr
DIR (b7) 0F dd rr
5
5
5
5
5
5
5
5
BRCLR n,opr,rel Branch if Bit n in M Clear
PC ← (PC) + 3 + rel ? (Mn) = 0
PC ← (PC) + 2
–
–
–
–
–
–
–
–
–
–
ꢀ
BRN rel
Branch Never
– REL
21 rr
3
Data Sheet
94
MC68HC908MR32 • MC68HC908MR16 — Rev. 6.0
Central Processor Unit (CPU) MOTOROLA
FREESCALE [ Freescale ]
