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M16C/5L Group, M16C/56 Group
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 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.
Table 6.1
Types of Resets
Reset Name
Hardware reset
Power-on reset
Voltage monitor 0 reset
Voltage monitor 2 reset
Oscillator stop detect reset
Watchdog timer reset
Software reset
RESET
Power-on reset
VCC
detection circuit
Watchdog timer
Oscillator stop/
XIN
restart detector
Figure 6.1
Reset Circuit Block Diagram
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
A low-level signal is applied to the RESET pin.
A rise in voltage on VCC
A drop in voltage on VCC (reference voltage: Vdet0)
A drop in voltage on VCC (reference voltage: Vdet2)
A stop in the main clock oscillator is detected.
The watchdog timer underflows.
Setting the PM03 bit in the PM0 register to 1.
Hardware reset
Power-on reset
circuit
Voltage monitor 0 reset
Voltage
Voltage monitor 2 reset
Watchdog timer reset
Software reset
CPU
Oscillator stop detect reset
Trigger
For the reset value and status, refer to 4. "Special Function
Registers (SFRs)" and 6.4.1 "Status after Reset".
6. Resets
Registers and Bits Not to Reset
(A)
N/A
N/A
(B)
(B) (C) (D)
(B) (C)
(B) (C)
SFR (A)
SFR (B)
SFR (C)
SFR (D)
Pins, CPU, or SFRs
not listed above.
Page 60 of 803
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