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TMP92CZ26A
92CZ26A-285
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
c
= 50 MHz, set each register as
follows;
* Clock state Clcok gear : 1/1
Prescaler of clock gear : 1/2
MSB LSB
7 6 5 4 3210
TA01RUN
←
– X X X ––0– Stop TMRA1 and clear it to 0.
TA01MOD
←
0 0 X X 0 1 X X
Select 8-bit timer mode and select φT1 (0.16 μs at f
C
= 50
MHz) as the input clock.
TA1REG
←
0 1 1 1 1101 Set TA1REG to 20
μs ÷ φT1 = 125(7DH)
INTETA1
←
X 1 0 1 X – – – Enable INTTA1 and set it to level 5.
TA01RUN
←
– X X X –11– Start TMRA1 counting.
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.