Renesas H8/300 Series Programming Manual page 117

SUB (SUBtract binary) (byte)
<Instruction Formats>
Addressing
mode
Register direct
Mnem. Operands
SUB.B Rs, Rd
Instruction code
1st byte 2nd byte
1 8 rs rd
111
3rd byte 4th byte
SUB
No. of
states
2