M16CSLASH62P datasheet(22/349 Pages) MITSUBISHI

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Reset

Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Software Reset

When the PM03 bit in the PM0 register is set to “1” (microcomputer reset), the microcomputer has its pins,

CPU, and SFR initialized. Then the program is executed starting from the address indicated by the reset

vector.

Select the main clock for the CPU clock source, and set the PM03 bit to “1” with main clock oscillation

satisfactorily stable.

At software reset, some SFR’s are not initialized. Refer to “SFR”. Also, since the PM01 to PM00 bits in the

PM0 register are not initialized, the processor mode remains unchanged.

Watchdog Timer Reset

Where the PM12 bit in the PM1 register is “1” (reset when watchdog timer underflows), the microcom-

puter initializes its pins, CPU and SFR if the watchdog timer underflows. Then the program is executed

starting from the address indicated by the reset vector.

At watchdog timer reset, some SFR’s are not initialized. Refer to “SFR”. Also, since the PM01 to PM00

bits in the PM0 register are not initialized, the processor mode remains unchanged.

Oscillation Stop Detection Reset

Where the CM27 bit in the CM2 register is “0” (reset at oscillation stop detection), the microcomputer

initializes its pins, CPU and SFR, coming to a halt if it detects main clock oscillation circuit stop. Refer to

the section “oscillation stop, re-oscillation detection function”.

At oscillation stop detection reset, some SFR’s are not initialized. Refer to the section “SFR”. Also, since

the PM01 to PM00 bits in the PM0 register are not initialized, the processor mode remains unchanged.

Figure 1.5.1. Example Reset Circuit

RESET

VCC1

RESET

VCC1

More than 20 cycles of XIN + td(P-R)

are needed.

Equal to or less

than 0.2VCC1

Note : When the microcomputer is used under the condition VCC1

≥ VCC2, make sure the VCC2 voltage does not

exceed the VCC1 voltage when powering up, or powering down the microcomputer.

Equal to or less

than 0.2VCC1

Recommended

operating

voltage

M16C/62P Datasheet(PDF) 22 Page - Mitsubishi Electric Semiconductor

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