Filter
Top Products
RL78/G1A CHAPTER 8 INTERVAL TIMER
8.4 12-bit Interval Timer Operation
8.4.1 12-bit interval timer operation timing
The count value specified for the ITCMP11 to ITCMP0 bits is used as an interval to operate as a 12-bit interval timer
that repeatedly generates interrupt requests (INTIT).
When the RINTE bit is set to 1, the 12-bit counter starts counting.
When the 12-bit counter value matches the value specified for the ITCMP11 to ITCMP0 bits, the 12-bit counter value is
cleared to 0, counting continues, and an interrupt request signal (INTIT) is generated at the same time.
The basic operation of the 12-bit interval timer is as follows.
Figure 8-5. 12-bit Interval Timer Operation Timing (ITCMP11 to ITCMP0 = 0FFH, count clock: f
SUB = 32.768 kHz)
INTIT
RINTE
0FFH
000H
0FFH
ITMCMP11 to
ITMCMP0
Count clock
12-bit counter
Period (7.81 ms)
After RINTE is changed from 0 to 1, counting starts
at the rising edge of the next count clock signal.
When RINTE is changed from 1 to 0,
the 12-bit counter is cleared without
synchronization with the count clock.
<R>
R01UH0305EJ0200 Rev.2.00 325
Jul 04, 2013