M30620FCAFP datasheet(22/274 Pages) MITSUBISHI

22 / 274 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Processor Mode

Figure 1.7.1. 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)

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.

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”

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

Note 2: Be sure to set this bit to 0 except products whose RAM size and ROM size exceed 15K bytes

and 192K bytes respectively.

In using M30624MAG/FGA, a product having a RAM of more than 15K bytes and a ROM of

more than 192K bytes, set this bit to “1” at the beginning of user program.

Specify D000016 or a subsequent address, which becomes an internal ROM area if PM13 is set

to “0” at the time reset is revoked, for the reset vector table of user program.

PM17

Wait bit

0 : No wait state

1 : Wait state inserted

Reserved bit

Must always be set to “0”

Internal reserved area

expansion bit (Note 2)

PM13

0: The same internal reserved

area as that of M16C/60 and

M16C/61 group

1: Expands the internal RAM area

and internal ROM area to 23 K

bytes and to 256K bytes

respectively. (Note 2)

Reserved bit

Must always be set to “0”

Reserved bit

Must always be set to “0”

M30620FCAFP Datasheet(PDF) 22 Page - Mitsubishi Electric Semiconductor

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