M30622ECTFP datasheet(29/184 Pages) MITSUBISHI

29 / 184 page

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Processor Mode

Figure 1.9.1. Processor mode register 0 and 1

Processor mode register 0 (Note 1)

Symbol

Address

When reset

PM0

000416

0016 (Note 2)

Bit name

Function

Bit symbol

0 0: Single-chip mode

0 1: Memory expansion mode

1 0: Inhibited

1 1: Microprocessor mode

b1 b0

PM03

PM01

PM00

Processor mode bit

PM02

R/W mode select bit

0 : RD,BHE,WR

1 : RD,WRH,WRL

Software reset bit

The device is reset when this bit is set

to “1”. The value of this bit is “0” when

read.

PM04

0 0 : Multiplexed bus is not used

0 1 : Allocated to CS2 space

1 0 : Allocated to CS1 space

1 1 : Allocated to entire space (Note4)

b5 b4

Multiplexed bus space

select bit

PM05

PM06

PM07

Port P40 to P43 function

select bit (Note 3)

0 : Address output

1 : Port function

(Address is not output)

BCLK output disable bit

0 : BCLK is output

1 : BCLK is not output

(Pin is left floating)

Processor mode register 1 (Note 1)

Symbol

Address

When reset

PM1

000516

00000XX02

Bit name

Function

Bit symbol

Nothing is assigned.

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

out to be indeterminate.

Reserved bit

Must always be set to “0”

PM17

Wait bit

0 : No wait state

1 : Wait state inserted

Memory area

expansion bit (Note 2)

0 0 : Normal mode

(Do not expand)

0 1 : Inhibited

1 0 : Memory area expansion

mode 1

1 1 : Memory area expansion

mode 2

b5 b4

PM15

PM14

Reserved bit

Must always be set to “0”

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

Note 2: If the VCC voltage is applied to the CNVSS, the value of this register when reset is 0316.

(PM00 and PM01 both are set to “1”.)

Note 3: Valid in microprocessor and memory expansion modes.

Note 4: If the entire space is of multiplexed bus in memory expansion mode, choose an 8-bit width.

The processor operates using the separate bus after reset is revoked, so the entire space multiplexed

bus cannot be chosen in microprocessor mode. The higher-order address becomes a port if the entire

space multiplexed bus is chosen, so only 256 bytes can be used in each chip select.

Note 5: The M16C/62T group is not guaranteed to operate in memory expansion and microprocessor modes.

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

Note 2: With the processor running in memory expansion mode or in microprocessor mode, setting this

bit provides the means of expanding the external memory area. (Normal mode: up to 1M byte,

expansion mode 1: up to 1.2 M bytes, expansion mode 2: up to 4M bytes)

For details, see “Memory space expansion functions”.

Note 3: The M16C/62T group is not guaranteed to operate in memory expansion and microprocessor modes.

Reserved bit

Must always be set to “0”

Reserved bit

Must always be set to “0”

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