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RL78/G1A CHAPTER 8 INTERVAL TIMER
8.4.2 Starting counter operation after returning from HALT or STOP mode and then shifting to HALT or STOP
mode again
When setting the RINTE bit to 1 to start operation of the counter after returning from the HALT or STOP mode and then
shifting to the HALT or STOP mode again, either confirm that the value written to the RINTE bit (1) has been applied, or
make sure that at least one count clock cycle elapses between returning from HALT or STOP mode and shifting to HALT
or STOP mode again.
• After setting RINTE to 1, confirm that the RINTE bit value is actually 1 by polling the bit, and then shift to the HALT or
STOP mode (see Example 1 in Figure 8-6).
• After setting RINTE to 1, wait for at least one cycle of the count clock to elapse before shifting to the HALT or STOP
mode (see Example 2 in Figure 8-6).
Figure 8-6. Shifting to HALT or STOP Mode after Setting RINTE to 1
RINTE = 1
HALT instruction execution
STOP instruction execution
Waiting at least for one
count clock
Restoring from HALT mode
Restoring from STOP mode
Shifts to HALT mode
or STOP mode
At least for one count
clock from restore
Yes
RINTE = 1
No
RINTE = 1?
Sets to counter operation
start
Checks the counter
o
p
eration start
HALT instruction execution
STOP instruction execution
Shifts to HALT mode or
STOP mode
Restoring from HALT mode
Restoring from STOP mode
Example 1 Example 2
R01UH0305EJ0200 Rev.2.00 326
Jul 04, 2013