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HD64F3664FP bảng dữ liệu(PDF) 77 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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Section 2 CPU
Rev. 6.00 Mar. 24, 2006 Page 49 of 412
REJ09B0142-0600
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.
Prior to executing BCLR
MOV.B
#3F,
R0L
MOV.B
R0L,
@RAM0
MOV.B
R0L,
@PCR5
The PCR5 value (H'3F) is written to a work area in
memory (RAM0) as well as to PCR5.
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
RAM0
0
0
1
1
1
1
1
1
BCLR instruction executed
BCLR
#0,
@RAM0
The BCLR instructions executed for the PCR5 work area
(RAM0).
After executing BCLR
MOV.B
@RAM0, R0L
MOV.B
R0L,
@PCR5
The work area (RAM0) value is written to PCR5.
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
0
PDR5
1
0
0
0
0
0
0
0
RAM0
0
0
1
1
1
1
1
0



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