Operation Of 16-Bit Timer/Event Counter 00; Interval Timer Operation - NEC 78K0/KD1 Series User Manual

6.4 Operation of 16-Bit Timer/Event Counter 00

6.4.1 Interval timer operation

Setting 16-bit timer mode control register 00 (TMC00) and capture/compare control register 00 (CRC00) as shown
in Figure 6-7 allows operation as an interval timer. Interrupt requests are generated repeatedly using the count value
preset in 16-bit timer capture/compare register 000 (CR000) as the interval.
When the count value of 16-bit timer counter 00 (TM00) matches the value set in CR000, counting continues with
the TM00 value cleared to 0 and the interrupt request signal (INTTM000) is generated.
The count clock of the 16-bit timer/event counter 00 can be selected with bits 0 and 1 (PRM000, PRM001) of
prescaler mode register 00 (PRM00).
See 6.5 Cautions for 16-Bit Timer/Event Counter 00 (2) 16-bit timer capture/compare register setting for
details of the operation when the compare register value is changed during timer count operation.
Figure 6-7. Control Register Settings for Interval Timer Operation
TMC00 0 0
CRC00 0 0
Remark 0/1: Setting 0 or 1 allows another function to be used simultaneously with the interval timer. For details,
see Figures 6-2 and 6-3.
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
(a) 16-bit timer mode control register 00 (TMC00)
TMC003 TMC002 TMC001
0 0 1 1 0/1
(b) Capture/compare control register 00 (CRC00)
CRC002 CRC001
0 0 0 0/1 0/1
Preliminary User's Manual U16315EJ1V0UD
OVF00
0
Clears and starts on match between TM00 and CR000.
CRC000
0
CR000 used as compare register
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