R8C/20 Group, R8C/21 Group 5. Resets
Rev.2.00 Aug 27, 2008 Page 21 of 458
REJ09B0250-0200
5. Resets
There are resets: 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.
NOTE:
1. Because this product is under development, specifications may be changed.
Figure 5.1 Block Diagram of Reset Circuit
Table 5.1 Reset Names and Sources
Reset Name Source
Hardware reset Input voltage of RESET
pin is held “L”
Power-on reset
(1)
VCC rises
Voltage monitor 1 reset
(1)
VCC falls (monitor voltage: Vdet1)
Voltage monitor 2 reset
(1)
VCC falls (monitor voltage: Vdet2)
Watchdog timer reset Underflow of watchdog timer
Software reset Write 1 to PM03 bit in PM0 register
RESET
Voltage monitor
1 reset
SFR
VCA26,
VW1C0 and
VW1C6 bits
SFR
VCA13, VCA27,
VW1C1,
VW1F0, VW1F1, VW1C7,
VW2C2 and VW2C3 bits
Pin, CPU and
SFR bits other than
those listed above
VCC
Hardware reset
Voltage monitor
2 reset
Watchdog timer
reset
Software reset
VCA13: Bit in VCA1 register
VCA26, VCA27: Bits in VCA2 register
VW1C0, VW1C1, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register
VW2C2, VW2C3 bits: Bits in VW2C register
Voltage
detection
circuit
Watchdog
timer
CPU
Power-on reset
circuit
Power-on reset
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