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HD404669 Datasheet, PDF (74/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669 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 53 Timer Write Register D Upper Digit (TWDU)
Timer read register D (TRDL: $011, TRDU: $012): Read-only register consisting of the lower digit
(TRDL) and the upper digit (TRDU). The operation of timer read register D is basically the same as that of
timer read registerC (TRCL: $00E, TRCU: $00F).
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 54 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 55 Timer Read Register D Upper Digit (TRDU)
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