Filter
Top Products
64
CHAPTER 6 INSTRUCTION OVERVIEW
6.1 Instruction Formats
The FR family CPU uses six types of instruction format, TYPE-A through TYPE-F.
■ Instruction Formats
All instructions used by the FR family CPU are written in the six formats shown in Figure 6.1-1.
Figure 6.1-1 Instruction Formats
■ Relation between Bit Patterns "Ri" and "Rj" and Register Values
Table 6.1-1 shows the relation between general-purpose register numbers and field bit pattern values.
MSBLSB
16bits
8bits
8bits
4bits
4bits
4bits
4bits
OP
OP
Rj
Ri
8bits 4bits 4bits
OP
u4/m4/i4
Ri
8bits8bits
OP
u8/rel8/dir/rlist
12bits 4bits
OP
Ri/Rs
5bits 11bits
OP
rel11
Rii8/o8
TYPE-A
TYPE-B
TYPE-C
TYPE-D
TYPE-F
TYPE-E
Table 6.1-1 General-purpose Register Numbers and Field Bit Pattern Values
Ri/Rj Register Ri/Rj Register Ri/Rj Register Ri/Rj Register
0000 R0 0100 R4 1000 R8 1100 R12
0001 R1 0101 R5 1001 R9 1101 R13
0010 R2 0110 R6 1010 R10 1110 R14
0011 R3 0111 R7 1011 R11 1111 R15