HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 92

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 2 CPU
2.6.5
The BSET, BCLR, BNOT, BST, and BIST instructions read a byte of data, modify a bit in the
byte, then write the byte back. Care is required when these instructions are used to access registers
with write-only bits, or to access ports.
The BCLR instruction can be used to clear flags in the on-chip registers. In an interrupt-handling
routine, for example, if it is known that the flag is set to 1, it is not necessary to read the flag ahead
of time. See section 2.10.3, Bit Manipulation Instructions, for details.
2.7
2.7.1
The CPU supports the eight addressing modes listed in table 2.11. Each instruction uses a subset
of these addressing modes. Arithmetic and logic instructions can use the register direct and
immediate modes. Data transfer instructions can use all addressing modes except program-counter
relative and memory indirect. Bit manipulation instructions use register direct, register indirect, or
absolute addressing mode to specify an operand, and register direct (BSET, BCLR, BNOT, and
BTST instructions) or immediate (3-bit) addressing mode to specify a bit number in the operand.
Table 2.11 Addressing Modes
No.
1
2
3
4
5
6
7
8
Rev.3.00 Mar. 26, 2007 Page 50 of 772
REJ09B0355-0300
Notes on Use of Bit Manipulation Instructions
Addressing Modes
Addressing Modes and Effective Address Calculation
Addressing Mode
Register direct
Register indirect
Register indirect with displacement
Register indirect with post-increment
Register indirect with pre-decrement
Absolute address
Immediate
Program-counter relative
Memory indirect
Symbol
Rn
@ERn
@(d:16,ERn)/@(d:32,ERn)
@ERn+
@–ERn
@aa:8/@aa:16/@aa:24/@aa:32
#xx:8/#xx:16/#xx:32
@(d:8,PC)/@(d:16,PC)
@@aa:8