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H8/3024 Datasheet(PDF) 79 Page - Renesas Technology Corp

Part # H8/3024
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  841 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3024 Datasheet(HTML) 79 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 2.00 Sep 20, 2005 page 41 of 800
REJ09B0260-0200
op
NOP, RTS, etc.
op
rn
rm
op
rn
rm
EA (disp)
Operation field only
ADD.B Rn, Rm, etc.
Operation field and register fields
MOV.B @(d:16, Rn), Rm
Operation field, register fields, and effective address extension
BRA d:8
Operation field, effective address extension, and condition field
op
cc
EA (disp)
Figure 2.9 Instruction Formats
2.6.5
Notes on Use of Bit Manipulation Instructions
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.
Step
Description
1
Read
Read one data byte at the specified address
2
Modify
Modify one bit in the data byte
3
Write
Write the modified data byte back to the specified address
Example 1: BCLR is executed to clear bit 0 in the port 4 data direction register (P4DDR) under
the following conditions.
P47, P46:
Input pins
P45 – P40: Output pins
The intended purpose of this BCLR instruction is to switch P40 from output to input.



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