Operation; Operation As Interval Timer (16 Bits) - NEC V850/SA1 mPD703015 Preliminary User's Manual

7.2 Operation

7.2.1 Operation as interval timer (16 bits)

Timer 0 operates as an interval timer when the 16-bit timer mode control register n (TMCn) and capture/compare
control register n (CRCn) are set as shown in Figure 7-7.
In this case, timer 0 repeatedly generates an interrupt at the time interval specified by the count value set in
advance to the 16-bit capture/compare register n (CRn0, CRn1).
When the count value of the 16-bit timer register n (TMn) coincides with the set value of CRn0, the value of TMn is
cleared to 0, and the timer continues counting. At the same time, an interrupt request signal (INTTMn0) is generated.
The count clock of the 16-bit timer/event counter can be selected by bits 0 and 1 (PRMn0 and PRMn1) of the
prescaler mode register n (PRMn).
Figure 7-7. Control Register Settings When Timer 0 Operates as Interval Timer
TMCn 0 0
CRCn 0 0
Remark
0/1: When these bits are reset to 0 or set to 1, the other functions can be used along with the interval
timer function. For details, refer to Figures 7-2 and 7-3.
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CHAPTER 7 TIMER/COUNTER FUNCTION
(a) 16-bit timer mode control register 0, 1 (TMC0, TMC1)
TMCn3
0 0 1
(b) Capture/compare control register 0, 1 (CRC0, CRC1)
0 0 0
TMCn2 TMCn1 OVFn
1 0/1 0
CRCn2 CRCn1 CRCn0
0/1 0/1 0
Clears and starts on
coincidence between
TMn and CRn0.
CRn0 as compare
register