H83065 datasheet(153/963 Pages) RENESAS

153 / 963 page

Section 6 Bus Controller

Rev. 4.00 Jan 26, 2006 page 131 of 938

REJ09B0276-0400

Bit 6—Address 22 Enable (A22E): Enables PA

5 to be used as the A22 address output pin. Writing

0 in this bit enables A

22 output from PA5. In modes other than 3, 4, and 5, this bit cannot be

modified and PA

5 has its ordinary port functions.

Bit 6

A22E

Description

0PA

5 is the A22 address output pin

1PA

5 is an input/output pin

(Initial value)

Bit 5—Address 21 Enable (A21E): Enables PA

6 to be used as the A21 address output pin. Writing

0 in this bit enables A

21 output from PA6. In modes other than 3, 4, and 5, this bit cannot be

modified and PA

6 has its ordinary port functions.

Bit 5

A21E

Description

0PA

6 is the A21 address output pin

1PA

6 is an input/output pin

(Initial value)

Bit 4—Address 20 Enable (A20E): Enables PA

7 to be used as the A20 address output pin. Writing

0 in this bit enables A

20 output from PA7. This bit can only be modified in mode 5.

Bit 4

A20E

Description

0PA

7 is the A20 address output pin (Initial value when in mode 3 or 4)

1PA

7 is an input/output pin (Initial value when in mode 1, 2, 5, 6 or 7)

Bits 3 to 1—Reserved: These bits cannot be modified and are always read as 1.

Bit 0—Bus Release Enable (BRLE): Enables or disables release of the bus to an external device.

Bit 0

BRLE

Description

The bus cannot be released to an external device

BREQ and BACK can be used as input/output pins

(Initial value)

The bus can be released to an external device

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