M16CSLASH62P datasheet(30/349 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Processor Mode

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Processor Mode

(1) Types of Processor Mode

Three processor modes are available to choose from: single-chip mode, memory expansion mode, and

microprocessor mode. Table 1.6.1 shows the features of these processor modes.

(2) Setting Processor Modes

Processor mode is set by using the CNVSS pin and the PM01 to PM00 bits in the PM0 register.

Table 1.6.2 shows the processor mode after hardware reset. Table 1.6.3 shows the PM01 to PM00 bit set

values and processor modes.

Table 1.6.2. Processor Mode After Hardware Reset

Table 1.6.1. Features of Processor Modes

Processor modes

Access space

Pins which are assigned I/O ports

Single-chip mode

SFR, internal RAM, internal ROM

All pins are I/O ports or peripheral

function I/O pins

Memory expansion mode

SFR, internal RAM, internal ROM,

external area (Note)

Some pins serve as bus control pins (Note)

Microprocessor mode

SFR, internal RAM, external area (Note) Some pins serve as bus control pins (Note)

Note : Refer to “Bus”.

CNVSS pin input level

Processor mode

VSS

Single-chip mode

VCC1 (Note 1, Note 2)

Microprocessor mode

Note 1: If the microcomputer is reset in hardware by applying VCC1 to the CNVSS pin (hardware reset 1

or hardware reset 2), the internal ROM cannot be accessed regardless of PM10 to PM00 bits.

Note 2: The multiplexed bus cannot be assigned to the entire CS space.

Table 1.6.3. PM01 to PM00 Bits Set Values and Processor Modes

PM01 to PM00 bits

Processor modes

Single-chip mode

Memory expansion mode

Must not be set

002

012

102

Microprocessor mode

112

Rewriting the PM01 to PM00 bits places the microcomputer in the corresponding processor mode regard-

less of whether the input level on the CNVSS pin is “H” or “L”. Note, however, that the PM01 to PM00 bits

cannot be rewritten to “012” (memory expansion mode) or “112” (microprocessor mode) at the same time

the PM07 to PM02 bits are rewritten. Note also that these bits cannot be rewritten to enter microprocessor

mode in the internal ROM, nor can they be rewritten to exit microprocessor mode in areas overlapping the

internal ROM.

If the microcomputer is reset in hardware by applying VCC1 to the CNVSS pin (hardware reset 1 or hard-

ware reset 2), the internal ROM cannot be accessed regardless of PM01 to PM00 bits.

Figures 1.6.1 and 1.6.2 show the registers associated with processor modes. Figure 1.6.3 show the

memory map in single chip mode.

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