HD404849 Datasheet, PDF (69/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
• Timer read register C (TRCL: $00E, TRCU: $00F): Read-only register consisting of a lower digit
(TRCL) and upper digit (TRCU) that holds the count of the timer C upper digit. See figures 56 and 57.
The operation of timer read register C is basically the same as that of timer read register B (TRBL:
$00A, TRBU: $00B).
Timer read register C (lower digit) (TRCL: $00E)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRCL3 TRCL2 TRCL1 TRCL0
Figure 56 Timer Read Register C Lower Digit (TRCL)
Timer read register C (upper digit) (TRCU: $00F)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRCU3 TRCU2 TRCU1 TRCU0
Figure 57 Timer Read Register C Upper Digit (TRCU)
Timer D
Timer D Functions: Timer D has the following functions.
• Free-running/reload timer
• External event counter
• Timer output operation (toggle, 0, 1, and PWM outputs)
• Input capture timer
The block diagram for each operation mode of timer D is shown in figures 58-1 and 58-2.
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