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HD6433397CP Datasheet(PDF) 77 Page - Renesas Technology Corp

Part # HD6433397CP
Description  Single-Chip Microcomputer
PDF  747 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433397CP Datasheet(HTML) 77 Page - Renesas Technology Corp

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47
Before Execution of BCLR Instruction
P4
7
P4
6
P4
5
P4
4
P4
3
P4
2
P4
1
P4
0
Input/output
Input
Input
Output
Output
Output
Output
Output
Output
Pin state
Low
High
Low
Low
Low
Low
Low
Low
DDR
00111111
DR
10000000
Execution of BCLR Instruction
BCLR
#0, @P4DDR
; Clear bit 0 in data direction register
After Execution of BCLR Instruction
P4
7
P4
6
P4
5
P4
4
P4
3
P4
2
P4
1
P4
0
Input/output
Output
Output
Output
Output
Output
Output
Output
Input
Pin state
Low
High
Low
Low
Low
Low
Low
High
DDR
1
111111
0
DR
10000000
Explanation: To execute the BCLR instruction, the CPU begins by reading P4DDR. Since
P4DDR is a write-only register, it is read as H'FF, even though its true value is H'3F.
Next the CPU clears bit 0 of the read data, changing the value to H'FE.
Finally, the CPU writes this value (H'FE) back to P4DDR to complete the BCLR instruction.
As a result, P4
0DDR is cleared to 0, making P40 an input pin. In addition, P47DDR and P46DDR
are set to 1, making P4
7 and P46 output pins.



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