Datasheet

Section 2 CPU
Rev. 8.00 Mar. 09, 2010 Page 70 of 658
REJ09B0042-0800
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
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