Resets - Renesas R8C/18 Series Hardware Manual

R8C/18 Group, R8C/19 Group
5.

Resets

The following resets are implemented: hardware reset, power-on reset, voltage monitor 1 reset, voltage
monitor 2 reset, watchdog timer reset, and software reset. Table 5.1 lists the Reset Names and Sources.
Table 5.1 Reset Names and Sources
Reset Name
Hardware reset
Power-on reset
Voltage monitor 1 reset
Voltage monitor 2 reset
Watchdog timer reset
Software reset
RESET
VCC
Figure 5.1 Block Diagram of Reset Circuit
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Input voltage of RESET pin is held "L"
VCC rises.
VCC falls (monitor voltage: Vdet1).
VCC falls (monitor voltage: Vdet2).
Underflow of watchdog timer
Write 1 to PM03 bit in PM0 register.
Hardware reset
Power-on reset
Power-on reset
circuit
Voltage monitor 1 reset
Voltage
detection
Voltage monitor 2 reset
circuit
Watchdog timer
Watchdog reset
timer
CPU
Software reset
Page 22 of 233
Source
VCA13: Bit in VCA1 register
VCA26, VCA27: Bits in VCA2 register
VW1C0 to VW1C2, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register
VW2C2, VW2C3: Bits in VW2C register
5. Resets
SFRs
Bits VCA26,
VW1C0, and
VW1C6
SFRs
Bits VCA13, VCA27,
VW1C1, VW1C2,
VW1F0, VW1F1, VW1C7,
VW2C2, and VW2C3
Pin, CPU, and
SFR bits other than
those listed above