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HD64F36022 Datasheet(PDF) 66 Page - Renesas Technology Corp

Part # HD64F36022
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

HD64F36022 Datasheet(HTML) 66 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 4.00 Sep. 23, 2005 Page 40 of 354
REJ09B0025-0400
Example 2: The BSET instruction is executed for port 5.
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 and output low-level signals. An example to output a high-level
signal at P50 with a BSET instruction is shown below.
• Prior to executing BSET
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
• BSET instruction executed
BSET
#0,
@PDR5
The BSET instruction is executed for port 5.
• After executing BSET
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
High
level
PCR5
0
0
1
1
1
1
1
1
PDR5
0
1
0
0
0
0
0
1
• Description on operation
1. When the BSET instruction is executed, first the CPU reads port 5.
Since P57 and P56 are input pins, the CPU reads the pin states (low-level and high-level
input).
P55 to P50 are output pins, so the CPU reads the value in PDR5. In this example PDR5 has a
value of H'80, but the value read by the CPU is H'40.
2. Next, the CPU sets bit 0 of the read data to 1, changing the PDR5 data to H'41.
3. Finally, the CPU writes H'41 to PDR5, completing execution of BSET.



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