HD64F38024HV Datasheet, PDF (94/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

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, R0L
MOV. B R0L, @RAM0
MOV. B R0L, @PCR3
The PCR3 value (H'3F) is written to a work area in memory
(RAM0) as well as to PCR3.
P37
P36
P35
P34
P33
P32
P31
P30
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
0
0
1
1
1
1
1
1
[B: BCLR instruction executed]
BCLR #0 , @RAM0
The BCLR instruction is executed designating the PCR3
work area (RAM0).
[C: After executing BCLR]
MOV. B @RAM0, R0L
MOV. B R0L, @PCR3
The work area (RAM0) value is written to PCR3.
P37
P36
P35
P34
P33
P32
P31
P30
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
0
PDR3
1
0
0
0
0
0
0
0
RAM0
0
0
1
1
1
1
1
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. 8.00 Mar. 09, 2010 Page 72 of 658
REJ09B0042-0800