Cmp (Compare) (Byte) - Renesas H8/300 Series Programming Manual

CMP (CoMPare) (byte)

<Operation>
Rd – (EAs); set condition code
<Assembly-Language Format>
CMP.B <EAs>, Rd
<Examples>
CMP.B #H'E5, R1H
CMP.B R3L, R4L
<Operand Size>
Byte
<Description>
This instruction subtracts an 8-bit source register or immediate data from an 8-bit destination
register and sets the condition code flags according to the result. The destination register is not
altered.
<Instruction Formats>
Addressing
mode
Immediate
Register direct
Mnem. Operands
CMP.B #xx:8,Rd
CMP.B Rs, Rd
<Condition Code>
I
— —
I: Previous value remains unchanged.
H: Set to "1" when there is a borrow from
bit 3; otherwise cleared to "0."
N: Set to "1" when the result is negative;
otherwise cleared to "0."
Z: Set to "1" when the result is zero;
otherwise cleared to "0."
V: Set to "1" if an overflow occurs;
otherwise cleared to "0."
C: Set to "1" if there is a borrow from bit 7;
otherwise cleared to "0."
Instruction code
1st byte 2nd byte
A rd IMM
1 C rs rd
67
H N Z
—
3rd byte 4th byte
CMP
V C
No. of
states
2
2