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HD404639R Datasheet, PDF (79/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer
HD404639R Series
Timer write register D (upper digit) (TWDU: $012)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
W
W
W
W
TWDU3 TWDU2 TWDU1 TWDU0
Figure 62 Timer Write Register D Upper Digit (TWDU)
• Timer read register D (TRDL: $011, TRDU: $012): Read-only register consisting of a lower digit
(TRDL) and an upper digit (TRDU) as shown in figures 63 and 64. The operation of timer read register
D is basically the same as that of timer read register B (TRBL: $00A, TRBU: $00B).
When the input capture timer operation is selected and if the count of timer D is read after a trigger is
input, either the lower or upper digit can be read first.
Timer read register D (lower digit) (TRDL: $011)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRDL3 TRDL2 TRDL1 TRDL0
Figure 63 Timer Read Register D Lower Digit (TRDL)
Timer read register D (upper digit) (TRDU: $012)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRDU3 TRDU2 TRDU1 TRDU0
Figure 64 Timer Read Register D Upper Digit (TRDU)
• Port mode register C (PMRC: $025): Write-only register that selects R40/EVND pin function as shown
in figure 50. It is reset to $0 by MCU reset.
• Detection edge select register 2 (ESR2: $027): Write-only register that selects the detection edge of
signals input to pin EVND as shown in figure 65. It is reset to $0 by MCU reset.
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