Renesas H8 Series Hardware Manual page 114

Section 2 CPU
To avoid this problem, store a copy of the PCR3 data in a work area in memory. Perform the bit
manipulation on the data in the work area, then write this data to PCR3.
[A: Prior to executing BCLR]
MOV. B #3F,
MOV. B R0L,
MOV. B R0L,
P3
7
Input/output Input
Pin state Low level High level Low level Low level Low level Low level Low level Low level
PCR3 0
PDR3 1
RAM0 0
[B: BCLR instruction executed]
BCLR #0 ,
[C: After executing BCLR]
MOV. B @RAM0, R0L
MOV. B R0L,
P3
7
Input/output Input
Pin state Low level High level Low level Low level Low level Low level Low level High level
PCR3 0
PDR3 1
RAM0 0
Table 2.12 lists the pairs of registers that share identical addresses. Table 2.13 lists the registers
that contain write-only bits.
Rev. 7.00 Mar 10, 2005 page 72 of 652
REJ09B0042-0700
The PCR3 value (H'3F) is written to a work area in memory
R0L
(RAM0) as well as to PCR3.
@RAM0
@PCR3
P3 P3
6 5
Input Output
0 1
0 0
0 1
The BCLR instruction is executed designating the PCR3
@RAM0
work area (RAM0).
The work area (RAM0) value is written to PCR3.
@PCR3
P3 P3
6 5
Input Output
0 1
0 0
0 1
P3 P3
4 3
Output Output
1 1
0 0
1 1
P3 P3
4 3
Output Output
1 1
0 0
1 1
P3 P3
2 1
Output Output
1 1
0 0
1 1
P3 P3
2 1
Output Output
1 1
0 0
1 1
P3
0
Output
1
0
1
P3
0
Output
0
0
0