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39
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.
P4
7
, P4
6
:
Input pins
P4
5
– P4
0
: Output pins
The intended purpose of this BCLR instruction is to switch P4
0
from output to input.
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