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3.12.4 Operation in Each Mode
(1) 8-bit timer mode
Both TMRA0 and TMRA1 can be used independently as 8-bit interval timers.
a. Generating interrupts at a fixed interval (Using TMRA1)
To generate interrupts at constant intervals using TMRA1 (INTTA1), first stop
TMRA1 then set the operation mode, input clock and a cycle to TA01MOD and
TA1REG register respectively. Then, enable the interrupt INTTA1 and start TMRA1
counting.
Example: To generate an INTTA1 interrupt every 20 us at f
follows;
* Clock state
MSB
7
←
TA01RUN
–
←
TA01MOD
0
←
TA1REG
0
← X
INTETA1
←
TA01RUN
–
X: Don't Care、−: No change
Select the input clock using Table 3.12.2.
Note:
The input clocks for TMRA0 and TMRA1 are different from as follows.
TMRA0: TA0IN input, φT1, φT4 or φT16.
TMRA1: Match output of TMRA0, φT1, φT16, and φT256.
Clcok gear :
Prescaler of clock gear : 1/2
LSB
6
5
4
3
2
1
0
X
X
X
–
–
0
–
0
X
X
0
1
X
X
1
1
1
1
1
0
1
1
0
1
X
–
–
–
X
X
X
–
1
1
–
92CZ26A-285
= 50 MHz, set each register as
c
1/1
Stop TMRA1 and clear it to 0.
Select 8-bit timer mode and select φT1 (0.16 μs at f
MHz) as the input clock.
s ÷ φT1 = 125(7DH)
μ
Set TA1REG to 20
Enable INTTA1 and set it to level 5.
Start TMRA1 counting.
TMP92CZ26A
= 50
C
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