Hitachi H8/300H Series Programming Manual page 216

Legend
IMM: Immediate data (2, 3, 8, 16, or 32 bits)
abs: Absolute address (8, 16, or 24 bits)
disp: Displacement (8, 16, or 24 bits)
rs, rd, rn: Register field (4 bits specifying an 8-bit or 16-bit register. rs corresponds to operand
symbols such as Rs, rd corresponds to operand symbols such as Rd, and rn
corresponds to the operand symbol Rn.)
ers, erd, ern: Register field (3 bits specifying a 32-bit register. ers corresponds to operand
symbols such as ERs, erd corresponds to operand symbols such as ERd, and ern
corresponds to the operand symbol ERn.)
The register fields specify general registers as follows.
Address Register
32-bit Register
Register General
Field Register
000 ER0
001 ER1
111 ER7
16-bit Register
Register General
Field Register
0000 R0
0001 R1
0111 R7
1000 E0
1001 E1
1111 E7
208
8-bit Register
Register General
Field Register
0000 R0H
0001 R1H
0111 R7H
1000 R0L
1001 R1L
1111 R7L