H8/3690 Datasheet

  • H8/3690

  • 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Seri...

  • 2454.14KB

  • 432页

  • RENESAS

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鈥?/div>
Prior to executing BCLR instruction
P57
Input/output
Pin state
PCR5
PDR5
Input
Low
level
0
1
P56
Input
High
level
0
0
P55
Output
Low
level
1
0
P54
Output
Low
level
1
0
P53
Output
Low
level
1
0
P52
Output
Low
level
1
0
P51
Output
Low
level
1
0
P50
Output
Low
level
1
0
鈥?/div>
BCLR instruction executed
BCLR
#0,
@PCR5
The BCLR instruction is executed for PCR5.
鈥?/div>
After executing BCLR instruction
P57
Input/output
Pin state
PCR5
PDR5
Output
Low
level
1
1
P56
Output
High
level
1
0
P55
Output
Low
level
1
0
P54
Output
Low
level
1
0
P53
Output
Low
level
1
0
P52
Output
Low
level
1
0
P51
Output
Low
level
1
0
P50
Input
High
level
0
0
鈥?/div>
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 PDR5 data in a work area in memory and
manipulate data of the bit in the work area, then write this data to PDR5.
Rev. 4.00, 03/04, page 45 of 400

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