HD404054 Datasheet, PDF (60/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 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 44 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 45 and 46. The operation of timer read register
D is basically the same as that of timer read register C (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 45 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 46 Timer Read Register D Upper Digit (TRDU)
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