Toshiba H1 Series - Manual (Page 288)

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 3 2 1 0
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 1 1 0 1 Set TA1REG to 20 μ s ÷ φT1 = 125(7DH)
INTETA1
← X 1 0 1 X
– – – Enable INTTA1 and set it to level 5.
TA01RUN
← –
X X X – 1 1 – 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.