CHAPTER 23 LOW-VOLTAGE DETECTOR
User’s Manual U16899EJ2V0UD
417
Figure 23-6. Example of Software Processing After Release of Reset (2/2)
•
Checking reset cause
Yes
No
Check reset cause
Power-on-clear/external
reset generated
Reset processing by
watchdog timer
Reset processing by
clock monitor
Reset processing by
low-voltage detector
No
Yes
WDTRF of RESF
register = 1?
CLMRF of RESF
register = 1?
LVIRF of RESF
register = 1?
Yes
No
(b) When used as interrupt
Check that “supply voltage (V
DD
)
≥
detection voltage (V
LVI
)” in the servicing routine of the LVI interrupt by
using bit 0 (LVIF) of the low-voltage detection register (LVIM). Clear bit 0 (LVIIF) of interrupt request flag
register 0L (IF0L) to 0 and enable interrupts (EI).
In a system where the supply voltage fluctuation period is long in the vicinity of the LVI detection voltage, wait
for the supply voltage fluctuation period, check that “supply voltage (V
DD
)
≥
detection voltage (V
LVI
)” using the
LVIF flag, and then enable interrupts (EI).
Содержание MuPD78F0132H
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