NEC PD78058FY(A) - Manual (Page 231)

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CHAPTER 9 8-BIT TIMER/EVENT COUNTERS
Figure 9-11. Interval Timer Operation Timing
Remark Interval time = (N + 1)
×
t : N = 0000H to FFFFH
Caution Even if the 16-bit timer/event counter mode is used, when the TM1 count value matches the
CR10 value, interrupt request (INTTM1) is generated and the F/F of 8-bit timer/event counter
output control circuit 1 is inverted. Thus, when using 8-bit timer/event counter as 16-bit
interval timer, set the INTTM1 mask flag TMMK1 to 1 to disable INTTM1 acknowledgment.
When reading the 16-bit timer register (TMS) count value, use the 16-bit memory manipu-
lation instruction.
Count Clock
TMS (TM1, TM2) Count Value
CR10, CR20
INTTM2
TO2
Interval Time Interval Time Interval Time
Interrupt Request Acknowledge Interrupt Request Acknowledge
N N N N
Count Start Clear Clear
0000 0001 N 0000 0001 N 0000 0001 N
t