M16C80 datasheet(39/358 Pages) RENESAS

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Page 28

6. Processor Mode

Figure 6.2 Processor mode register 1

Processor mode register 1 (Note 1) :Flash memory version

Symbol

Address

When reset

PM1

000516

0016

Bit name

Function

Bit symbol

b7 b6

b1 b0

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

Note 2: When mode 3 is selected, DRAMC is not used.

Note 3: Valid in memory expansion mode or in microprocessor mode.

Note 4: When selecting P53/BCLK, set bits 0 and 1 of system clock control register 0 (CM00, CM01) to "0".

Note 5: Rewrite this bit when the main clock is in division by 8 mode.

ALE pin select bit (Note 3)

0 0 : No ALE

0 1 : P53/BCLK (Note 4)

1 0 : P56/RAS

1 1 : P54/HLDA

b5 b4

PM15

PM14

Reserved bit

Must always be set to “0”

Reserved bit

Must always be set to “1” (Note 5)

PM12

Internal memory wait bit

0 : No wait state

1 : Wait state inserted

External memory area

mode bit (Note 3)

0 0 : Mode 0 (P44 to P47 : A20 to A23)

0 1 : Mode 1 (P44 : A20,

P45 to P47 : CS2 to CS0)

1 0 : Mode 2 (P44, P45 : A20, A21,

P46, P47 : CS1, CS0)

1 1 : Mode 3 (Note 2)

(P44 to P47 : CS3 to CS0)

b1 b0

PM11

PM10

Processor mode register 1 (Note 1) :Mask ROM version

ROMless version (144-pin version)

Symbol

Address

When reset

PM1

000516

0016

Bit name

Function

Bit symbol

b5 b4

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

Note 2: When mode 3 is selected, DRAMC is not used.

Note 3: Valid in memory expansion mode or in microprocessor mode.

Note 4: When selecting P53/BCLK, set bits 0 and 1 of system clock control register 0 (CM00, CM01) to "0".

ALE pin select bit (Note 3)

0 0 : No ALE

0 1 : P53/BCLK (Note 4)

1 0 : P56/RAS

1 1 : P54/HLDA

b5 b4

PM15

PM14

Reserved bit

Must always be set to “0”

Nothing is assinged. When read, the content is indeterminate.

PM12

Internal memory wait bit

0 : No wait state

1 : Wait state inserted

External memory area

mode bit (Note 3)

0 0 : Mode 0 (P44 to P47 : A20 to A23)

0 1 : Mode 1 (P44 : A20,

P45 to P47 : CS2 to CS0)

1 0 : Mode 2 (P44, P45 : A20, A21,

P46, P47 : CS1, CS0)

1 1 : Mode 3 (Note 2)

(P44 to P47 : CS3 to CS0)

b1 b0

PM11

PM10

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