h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 108

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 2 CPU
Figure 2.12 shows examples of instruction formats.
2.6.5
The BSET, BCLR, BNOT, BST, and BIST instructions read a byte of data, carry out bit
manipulation, then write back the byte of data. Caution is therefore required when using these
instructions on a register containing write-only bits, or a port.
The BCLR instruction can be used to clear internal I/O register flags to 0. In this case, the relevant
flag need not be read beforehand if it is clear that it has been set to 1 in an interrupt handling
routine, etc.
Rev. 4.00 Jun 06, 2006 page 54 of 1004
REJ09B0301-0400
(1) Operation field only
(2) Operation field and register fields
(3) Operation field, register fields, and effective address extension
(4) Operation field, effective address extension, and condition field
Notes on Use of Bit-Manipulation Instructions
op
op
op
Figure 2.12 Instruction Formats (Examples)
cc
EA (disp)
op
rn
rn
EA (disp)
rm
rm
NOP, RTS, etc.
ADD.B Rn, Rm, etc.
MOV.B @(d:16, Rn), Rm, etc.
BRA d:16, etc