upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 381

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

• Checking reset cause
(b) When used as interrupt
Check that “supply voltage (V
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
LVIF flag, and then enable interrupts (EI).
Figure 22-6. Example of Software Processing After Release of Reset (2/2)
Reset processing by
low-voltage detector
Check reset cause
WDTRF of RESF
CLMRF of RESF
LVIRF of RESF
register = 1?
register = 1?
register = 1?
CHAPTER 22 LOW-VOLTAGE DETECTOR
DD
) ≥ detection voltage (V
No
No
Yes
User’s Manual U16962EJ3V0UD
Yes
Yes
No
Power-on-clear/external
Reset processing by
Reset processing by
LVI
reset generated
watchdog timer
)” in the servicing routine of the LVI interrupt by
clock monitor
DD
) ≥ detection voltage (V
LVI
)” using the
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