M16CSLASH62M datasheet(42/615 Pages) RENESAS

42 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Processor Mode

1-23

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: Do not set

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.

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)

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: When the reset is revoked, this bit is set to “0”. To expand the internal area, set this bit to “1”

in user program. And the top of user program must be allocated to D000016 or subsequent

address.

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 internal RAM area is 15 kbytes

or less and the internal ROM area is

192 kbytes or less

1: Expands the internal RAM area

and internal ROM area to over 15

kbytes and to over 192 kbytes

respectively. (Note 2)

Reserved bit

Must always be set to “0”

Reserved bit

Must always be set to “0”

Figure 1.7.1 shows the processor mode register 0 and 1.

Figure 1.7.2 shows the memory maps applicable for each of the modes.

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