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HD6433644R Datasheet(PDF) 76 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 76 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 6.00 Sep 12, 2006 page 56 of 526
REJ09B0326-0600
As a result of this operation, bit 0 in PCR3 becomes 0, making P30 an input port. However, bits 7
and 6 in PCR3 change to 1, so that P37 and P36 change from input pins to output pins.
To avoid this problem, store a copy of the PCR3 data in a work area in memory. Perform the bit
manipulation on the data in the work area, then write this data to PCR3.
[A: Prior to executing BCLR]
MOV. B
#3F,
R0L
MOV. B
R0L,
@RAM0
MOV. B
R0L,
@PCR3
The PCR3 value (H'3F) is written to a work area in
memory (RAM0) as well as to PCR3.
P37
P36
P35
P34
P33
P32
P31
P30
Input/output
Input
Input
Output
Output
Output
Output
Output
Output
Pin state
Low
level
High
level
Low
level
Low
level
Low
level
Low
level
Low
level
Low
level
PCR3
0
0
1
1
1
1
1
1
PDR3
1
0
0
0
0
0
0
0
RAM0
0
0
1
1
1
1
1
1
[B: BCLR instruction executed]
BCLR
#0
,
@RAM0
The BCLR instruction is executed designating the PCR3
work area (RAM0).
[C: After executing BCLR]
MOV. B
@RAM0, R0L
MOV. B
R0L,
@PCR3
The work area (RAM0) value is written to PCR3.
P37
P36
P35
P34
P33
P32
P31
P30
Input/output
Input
Input
Output
Output
Output
Output
Output
Output
Pin state
Low
level
High
level
Low
level
Low
level
Low
level
Low
level
Low
level
High
level
PCR3
0
0
1
1
1
1
1
0
PDR3
1
0
0
0
0
0
0
0
RAM0
0
0
1
1
1
1
1
0



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