R01UH0822EJ0100 Rev.1.00
Page 103 of 1041
Jul 31, 2019
RX13T Group
6. Resets
Figure 6.2
Operation Examples During Voltage Monitoring 1 Reset and Voltage Monitoring 2 Reset
6.3.4
Independent Watchdog Timer Reset
Independent watchdog timer reset is an internal reset generated by the independent watchdog timer.
Output of the independent watchdog timer reset from the independent watchdog timer can be selected by setting the
IWDT reset control register (IWDTRCR) and option function select register 0 (OFS0).
When output of the independent watchdog timer reset is selected, an independent watchdog timer reset is generated if the
independent watchdog timer underflows, or if data is written outside the refresh-permitted period. When the internal
reset time (tRESW2) has elapsed after the independent watchdog timer reset has been generated, the internal reset is
canceled and the CPU starts the reset exception handling.
For details on the independent watchdog timer reset, see
section 22, Independent Watchdog Timer (IWDTa)
.
6.3.5
Software Reset
The software reset is an internal reset generated by the software reset circuit.
When A501h is written to SWRR, a software reset is generated. When the internal reset time (tRESW2) has elapsed after
the software reset is generated, the internal reset is canceled and the CPU starts the reset exception handling.
External voltage
VCC
Vdeti*
1
RES# pin
Voltage detection i
signal (Low is valid)
tLVDi*
2
RES# pin reset
RSTSR0.LVDiRF
tLVDi*
2
RES# pin reset
RSTSR0.LVDiRF
LVCMPCR.LVDiE
LVDi valid setting
LVDiCR0.LVDiRN = 0
LVDiCR0.LVDiRN = 1
Voltage detection i
signal (Low is valid)
Internal reset signal
Internal reset signal
Note:
For details on the electrical characteristics, see the Electrical Characteristics section.
Note 1. Vdeti shows a detection level of voltage monitoring 1 reset and voltage monitoring 2 reset. (i = 1, 2)
Note 2. tLVDi shows a time for voltage monitoring 1 reset and voltage monitoring 2 reset. (i = 1, 2)