HD404356 Datasheet, PDF (57/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
• Port mode register A (PMRA: $004): Write-only register that selects R0₃/TOC pin function as shown in
figure 44. It is reset to $0 by MCU reset.
Port mode register A (PMRA: $004)
Bit
Initial value
Read/Write
Bit name
3
0
W
PMRA3
2
1
0
0
W
W
PMRA2 PMRA1
0
0
W
PMRA0
PMRA2
0
1
R0₃/TOC Mode Selection
R0₃
TOC
PMRA3
0
1
D₃/BUZZ Mode Selection
D₃
BUZZ
PMRA0
0
1
R0₂/SO Mode Selection
R0₂
SO
PMRA1
0
1
R0₁/SI Mode Selection
R0₁
SI
Figure 44 Port Mode Register A (PMRA)
• Timer write register C (TWCL: $00E, TWCU: $00F): Write-only register consisting of the lower digit
(TWCL) and the upper digit (TWCU) as shown in figures 45 and 46. The operation of timer write
register C is basically the same as that of timer write register B (TWBL: $00A, TWBU: $00B).
Timer write register C (lower digit) (TWCL: $00E)
Bit
Initial value
Read/Write
Bit name
3
0
W
TWCL3
2
0
W
TWCL2
1
0
W
TWCL1
0
0
W
TWCL0
Figure 45 Timer Write Register C Lower Digit (TWCL)
Timer write register C (upper digit) (TWCU: $00F)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
W
W
W
W
TWCU3 TWCU2 TWCU1 TWCU0
Figure 46 Timer Write Register C Upper Digit (TWCU)
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