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CHAPTER 9 8-BIT TIMER/EVENT COUNTER
212
9.4 8-Bit Timer/Event Counter Operations
9.4.1 8-bit timer/event counter mode
(1) Interval timer operations
The 8-bit timer/event counter operates as an interval timer which generates interrupt requests repeatedly at
intervals of the count value preset to 8-bit compare registers (CR10 and CR20).
When the count values of the 8-bit timer registers 1 and 2 (TM1 and TM2) match the values set to CR10 and
CR20, counting continues with the TM1 and TM2 values cleared to 0 and the interrupt request signals (INTTM1
and INTTM2) are generated.
Count clock of TM1 can be selected with bits 0 to 3 (TCL10 toTCL13) of the timer clock select register 1 (TCL1).
Count clock of TM2 can be selected with bits 4 to 7 (TCL14 toTCL17) of the timer clock select register 1 (TCL1).
For the operation after changing compare register value during timer count operation, refer to 9.5 Cautions on
8-Bit Timer/Event Counter (3).
Figure 9-8. Interval Timer Operation Timings
Remark
Interval time = (N + 1)
×
t : N = 00H to FFH
Count Clock
TM1 Count Value
CR10
INTTM1
TO1
Count Start
Clear
Clear
N
N
N
N
Interrupt Request
Acknowledge
Interrupt Request
Acknowledge
Interval Time
Interval Time
Interval Time
t
00
01
N
00
01
N
00
01
N
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