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HD6433637SW Datasheet(PDF) 67 Page - Renesas Technology Corp

Part # HD6433637SW
Description  8-Bit Microcomputer
PDF  418 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433637SW Datasheet(HTML) 67 Page - Renesas Technology Corp

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53
Bit Manipulation in a Register Containing a Write-only Bit
Example 3: In this example, the port 6 control register PCR6 is accessed by a BCLR instruction.
As in the examples above, P6
7 and P66 are input pins, with a low-level signal input at P67 and a
high-level signal at P6
6. The remaining pins, P65 to P60, are output pins that output low-level
signals. In this example, the BCLR instruction is used to change pin P6
0 to an input port. It is
assumed that a high-level signal will be input to this input pin.
[A: Prior to executing BCLR]
P6
7
P6
6
P6
5
P6
4
P6
3
P6
2
P6
1
P6
0
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
PCR6
00111111
PDR6
10000000
[B: BCLR instruction executed]
BCLR
#0,
@PCR6
The BCLR instruction is executed designating PCR6.
[C: After executing BCLR]
P6
7
P6
6
P6
5
P6
4
P6
3
P6
2
P6
1
P6
0
Input/output
Output
Output
Output
Output
Output
Output
Output
Input
Pin state
Low
level
High
level
Low
level
Low
level
Low
level
Low
level
Low
level
High
level
PCR6
1
1
11111
0
PDR6
10000000
[D: Explanation of how BCLR operates]
When the BCLR instruction is executed, first the CPU reads PCR6. Since PCR6 is a write-only
register, the CPU reads a value of H'FF, even though the PCR6 value is actually H'3F.
Next, the CPU clears bit 0 in the read data to 0, changing the data to H'FE. Finally, this value
(H'FE) is written to PCR6 and BCLR instruction execution ends.
As a result of this operation, bit 0 in PCR6 becomes 0, making P6
0 an input port. However, bits 7
and 6 in PCR6 change to 1, so that P6
7 and P66 change from input pins to output pins.



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