M16C30L Datasheet, PDF(23/166 Page) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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M16C30L Datasheet, PDF (23/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Processor Mode

Mitsubishi microcomputers

M16C / 30L Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Figure 1.7.1 shows the processor mode register 0 and 1.

Figure 1.7.2 shows the memory maps in each processor modes.

Processor mode register 0 (Note 1)

b7 b6 b5 b4 b3 b2 b1 b0

Symbol

PM0

Address

000416

When reset

0016 (Note 2)

Bit symbol

Bit name

Function

PM00

PM01

Processor mode bit

b1 b0

0 0: Single-chip mode

0 1: Memory expansion mode

1 0: Must not be set

1 1: Microprocessor mode

PM02

PM03

PM04

PM05

R/W mode select bit

Software reset bit

Multiplexed bus space

select bit

0 : RD,BHE,WR

1 : RD,WRH,WRL

The device is reset when this bit is set

to â1â. The value of this bit is â0â when

read.

b5 b4

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)

PM06

Port P40 to P43 function

select bit (Note 3)

0 : Address output

1 : Port function

(Address is not output)

PM07

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 â1â 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 â1â.)

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.

P31 to P37 become 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)

b7 b6 b5 b4 b3 b2 b1 b0

00 00

Symbol

PM1

Address

000516

When reset

000000X02

Bit symbol

Reserved bit

Bit name

Function

Must always be set to â0â

Nothing is assigned.

In an attempt to write to this bit, write â0â. The value, if read, turns out to be

indeterminate.

PM12

Watchdog timer function 0 : Interrupt

select bit

1 : Reset (Note 2)

Reserved bit

Must always be set to â0â

Reserved bit

Must always be set to â0â

(Note 2)

Reserved bit

Must always be set to â0â

Reserved bit

PM17

Wait bit

Must always be set to â0â

0 : No wait state

1 : Wait state inserted

Note 1: Set bit 1 of the protect register (address 000A16) to â1â when writing new values to this register.

Note 2: This bit can only be set to â1â.

Figure 1.7.1. Processor mode register 0 and 1

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