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HD64F36024 Datasheet(PDF) 68 Page - Renesas Technology Corp

Part # HD64F36024
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
PDF  384 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD64F36024 Datasheet(HTML) 68 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 4.00 Sep. 23, 2005 Page 42 of 354
REJ09B0025-0400
(2)
Bit Manipulation in a Register Containing a Write-Only Bit
Example 3: BCLR instruction executed designating port 5 control register PCR5
P57 and P56 are input pins, with a low-level signal input at P57 and a high-level signal input at
P56. P55 to P50 are output pins that output low-level signals. An example of setting the P50 pin as
an input pin by the BCLR instruction is shown below. It is assumed that a high-level signal will be
input to this input pin.
• Prior to executing BCLR
P57
P56
P55
P54
P53
P52
P51
P50
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
PCR5
0
0
1
1
1
1
1
1
PDR5
1
0
0
0
0
0
0
0
• BCLR instruction executed
BCLR
#0,
@PCR5
The BCLR instruction is executed for PCR5.
• After executing BCLR
P57
P56
P55
P54
P53
P52
P51
P50
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
PCR5
1
1
1
1
1
1
1
0
PDR5
1
0
0
0
0
0
0
0
• Description on operation
1. When the BCLR instruction is executed, first the CPU reads PCR5. Since PCR5 is a write-only
register, the CPU reads a value of H'FF, even though the PCR5 value is actually H'3F.
2. Next, the CPU clears bit 0 in the read data to 0, changing the data to H'FE.
3. Finally, H'FE is written to PCR5 and BCLR instruction execution ends.
As a result of this operation, bit 0 in PCR5 becomes 0, making P50 an input port. However,
bits 7 and 6 in PCR5 change to 1, so that P57 and P56 change from input pins to output pins.
To prevent this problem, store a copy of the PCR5 data in a work area in memory and
manipulate data of the bit in the work area, then write this data to PCR5.



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