Datasheet

RL78/L12 CHAPTER 8 12-BIT INTERVAL TIMER
R01UH0330EJ0200 Rev.2.00 317
Dec 13, 2013
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 an 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
ITCMP11-
ITCMP0
RINTE
Count clock
12-bit counter
0FFH
000H
0FFH
After RINTE is changed from 0 to 1, counting starts
at the two rise of the count clock signal.
When RINTE is changed from 1 to 0,
the 12-bit counter is cleared without
synchronization with the count clock.
Period (7.81 ms)