Renesas M32R-FPU - Manual (Page 36)

2
2-12 M32R-FPU Software Manual (Rev.1.01)
2.2 Instruction format
There are two major instruction formats: two 16-bit instructions packed together within a
word boundary, and a single 32-bit instruction (see Figure 2.2.1). Figure 2.2.2 shows
the instruction format of M32R CPU.
Fig. 2.2.2 Instruction format of M32R CPU
Fig. 2.2.1 16-bit instruction and 32-bit instruction
< 16-bit instruction >
op1 R 1 R 2 op2
op1 R 1 c
op1 cond c
op1 R 1 R 2 op2 c
op1 R 1 R 2 op2 c
op1 R 1 c
op1 cond c
< 32-bit instruction >
R 1 = R 1 op R 2
R 1 = R 1 op c
Branch (Short Displacement)
R
1
= R
1
op c
Branch
Compare and Branch
R 1 = R 2 op c
op1 R s 0000 op2 op3 R d 0000 op4
op1 R
s1
R
s2
op2
Floating-point 2-operand
(R
d =op(R s ))
Floating-point 3-operand
(R
d =R s 1 op R s 2)
op3 R
d 0000 op4
16-bit instruction A
+ 0 + 1 + 2 + 3
1 word
32-bit instruction
address
1 word
+ 0 + 1 + 2 + 3 address
16-bit instruction B
INSTRUCTION SET
2.2 Instruction format