M30622ECTFP datasheet(28/184 Pages) MITSUBISHI

28 / 184 page

Mitsubishi microcomputers

M16C / 62T 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 almost the same effect as a hardware reset. The contents of internal

RAM are preserved.

Software Reset

Processor Mode

(1) Types of Processor Mode

One of three processor modes can be selected: single-chip mode, memory expansion mode, and micro-

processor mode. The functions of some pins, the memory map, and the access space differ according to

the selected processor mode.

But M16C/62T group is not guaranteed to operate in memory expansion and microprocessor modes.

• Single-chip mode

In single-chip mode, only internal memory space (SFR, internal RAM, and internal ROM) can be

accessed. Ports P0 to P10 can be used as programmable I/O ports or as I/O ports for the internal

peripheral functions.

• Memory expansion mode

In memory expansion mode, external memory can be accessed in addition to the internal memory

space (SFR, internal RAM, and internal ROM).

In this mode, some of the pins function as the address bus, the data bus, and as control signals. The

number of pins assigned to these functions depends on the bus and register settings. (See “Bus

Settings” for details.)

• Microprocessor mode

In microprocessor mode, the SFR, internal RAM, and external memory space can be accessed. The

internal ROM area cannot be accessed.

In this mode, some of the pins function as the address bus, the data bus, and as control signals. The

number of pins assigned to these functions depends on the bus and register settings. (See “Bus

Settings” for details.)

(2) Setting Processor Modes

The processor mode is set using the CNVSS pin and the processor mode bits (bits 1 and 0 at address

000416). Do not set the processor mode bits to “102”.

Regardless of the level of the CNVSS pin, changing the processor mode bits selects the mode. Therefore,

never change the processor mode bits when changing the contents of other bits. Also do not attempt to

shift to or from the microprocessor mode within the program stored in the internal ROM area.

• Applying VSS to CNVSS pin

The microcomputer begins operation in single-chip mode after being reset. Memory expansion mode

is selected by writing “012” to the processor mode is selected bits.

• Applying VCC to CNVSS pin

The microcomputer starts to operate in microprocessor mode after being reset.

Figure 1.9.1 shows the processor mode register 0 and 1.

Figure 1.10.1 shows the memory maps applicable for each of the modes when memory area dose not be

expanded (normal mode).

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