Section 2 CPU
Rev. 7.00 Mar 10, 2005 page 70 of 652
REJ09B0042-0700
To avoid this problem, store a copy of the PDR3 data in a work area in memory. Perform the bit
manipulation on the data in the work area, then write this data to PDR3.
[A: Prior to executing BSET]
MOV. B #80, R0L The PDR3 value (H'80) is written to a work area in memory
MOV. B R0L, @RAM0 (RAM0) as well as to PDR3
MOV. B R0L, @PDR3
P3
7
P3
6
P3
5
P3
4
P3
3
P3
2
P3
1
P3
0
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
PCR300111111
PDR310000000
RAM010000000
[B: BSET instruction executed]
BSET #0 , @RAM0 The BSET instruction is executed designating the PDR3
work area (RAM0).
[C: After executing BSET]
MOV. B @RAM0, R0L The work area (RAM0) value is written to PDR3.
MOV. B R0L, @PDR3
P3
7
P3
6
P3
5
P3
4
P3
3
P3
2
P3
1
P3
0
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
PCR300111111
PDR310000001
RAM010000001
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