57
[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
PCR3
0
0
1
1
1
1
1
1
PDR3
1
0
0
0
0
0
0
0
RAM0
1
0
0
0
0
0
0
0
[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
PCR3
0
0
1
1
1
1
1
1
PDR3
1
0
0
0
0
0
0
1
RAM0
1
0
0
0
0
0
0
1