R01UH0092EJ0110 Rev.1.10
Page 43 of 807
Jul 31, 2012
M16C/64C Group
6. Resets
6.
Resets
6.1
Introduction
The following resets can be used to reset the MCU: hardware reset, power-on reset, voltage monitor 0
reset, voltage monitor 1 reset, voltage monitor 2 reset, oscillator stop detect reset, watchdog timer reset,
and software reset.
Table 6.1 lists the Types of Resets and Figure 6.1 shows the Reset Circuit Block Diagram. Symbols (A) to
(D) in the table and figure is explained in Table 6.2. Table 6.3 lists the I/O Pins.
Figure 6.1
Reset Circuit Block Diagram
Table 6.1
Types of Resets
Reset Name
Trigger
Registers and Bits Not to Reset
Hardware reset
A low-level signal is applied to the
RESET
pin.
(A)
Power-on reset
A rise in voltage on VCC1
N/A
Voltage monitor 0 reset
A drop in voltage on VCC1 (reference voltage: Vdet0)
N/A
Voltage monitor 1 reset
A drop in voltage on VCC1 (reference voltage: Vdet1)
(B)
Voltage monitor 2 reset
A drop in voltage on VCC1 (reference voltage: Vdet2)
(B)
Oscillator stop detect reset
A stop in the main clock oscillator is detected.
(B) (C) (D)
Watchdog timer reset
The watchdog timer underflows.
(B) (C)
Software reset
Setting the PM03 bit in the PM0 register to 1.
(B) (C)
RESET
Hardware reset
Voltage detector
Watchdog timer
CPU
Voltage monitor 0 reset
Pins, CPU, or SFRs
not listed above
VCC1
Voltage monitor 1 reset
Watchdog timer reset
Software reset
Voltage monitor 2 reset
SFR (A)
Oscillator stop detect reset
XIN
Power-on reset
circuit
Oscillator stop/
restart detector
Power-on reset
SFR (D)
SFR (C)
SFR (B)
For the reset value and status, refer to 4. “Special Function Registers
(SFRs)” and 6.4.1 “Status after Reset”.
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