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M16C/62P Group (M16C/62P, M16C/62PT)
RESET
NOTES:
1. If VCC1>VCC2, the VCC2 voltage must be lower than that of VCC1 when the power
Figure 5.1 Example Reset Circuit
5.3 Software Reset
The microcomputer resets pins, the CPU and SFR when the PM03 bit in the PM0 register is set to "1"
(microcomputer reset). Then the microcomputer executes the program in an address determined by the
reset vector.
Set the PM03 bit to "1" while the main clock is selected as the CPU clock and the main clock oscillation is
stable.
In the software reset, the microcomputer does not reset a part of the SFR. Refer to 4. SFR for details.
Processor mode remains unchanged since the PM01 to PM00 bits in the PM0 register are not reset.
Figure 5.2 shows the reset sequence.
5.4 Watchdog Timer Reset
The microcomputer resets pins, the CPU and SFR when the CM06 bit in the CM0 register is set to "1"
(reset) and the watchdog timer underflows. Then the microcomputer executes the program in an address
determined by the reset vector.
In the watchdog timer reset, the microcomputer does not reset a part of the SFR. Refer to 4. SFR for
details. Processor mode remains unchanged since the PM01 to PM00 bits in the PM0 register are not
reset.
5.5 Oscillation Stop Detection Reset
The microcomputer resets and stops pins, the CPU and SFR when the CM27 bit in the CM2 register is 0, if
it detects main clock oscillation circuit stop. Refer to 10.6 Oscillation Stop, Re-Oscillation Detection
Function for details.
In the oscillation stop detection reset, the microcomputer does not reset a part of the SFR. Refer to 4. SFR
for details. Processor mode remains unchanged since the PM01 to PM00 bits in the PM0 register are not
reset.
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
Recommended
operation voltage
VCC1
0V
VCC1
RESET
0V
is being turned on or off.
page 32
f o
3
6
4
0.2VCC1
0.2VCC1 or below
or below
Supply a clock with td(P-R) + 2
0 or more cycles to the XIN pin
5. Reset
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