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M30220

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

Software Reset

Mitsubishi microcomputers

M30220 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Software Reset

Writing “1” to bit 3 of the processor mode register 0 (address 000416) applies a (software) reset to the

microcomputer. A software reset has the same effect as a hardware reset. The contents of internal RAM

are preserved.

Figure 1.8.1 shows the processor mode register 0 and 1.

Processor mode register 0 (Note)

b7 b6 b5 b4 b3 b2 b1 b0

0

Symbol

PM0

Address

000416

When reset

XXXX00002

Bit symbol

Bit name

PM00

Processor mode bit

PM01

Function

b1 b0

0 0: Single-chip mode

0 1: Must not be set

1 0: Must not be set

1 1: Must not be set

RW

Reserved bit

Must always be set to “0”

PM03

Software reset bit

The device is reset when this bit

is set to “1”. The value of this bit

is “0” when read.

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns

out to be indeterminate.

Note: Set bit 1 of the protect register (address 000A16) to “1” when writing new

values to this register.

Processor mode register 1 (Note)

b7 b6 b5 b4 b3 b2 b1 b0

00

Symbol

PM1

Address

000516

When reset

0XXXXX002

Bit symbol

Bit name

Function

RW

Reserved bit

Must always be set to “0”

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns

out to be indeterminate.

PM17

Wait bit

0 : No wait state

1 : Wait state inserted

Note: Set bit 1 of the protect register (address 000A16) to “1” when writing new values

to this register.

Figure 1.8.1. Processor mode register 0 and 1

18

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