MB90F482 datasheet(69/113 Pages) FUJITSU

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MB90480/485 Series

18. External Bus Pin Control Circuit

The external bus pin control circuit controls the external bus pins used to expand the CPU address/data bus

connections to external circuits.

(1) Register List

(2) Block Diagram

• Auto ready function select register (ARSR)

• External address output control register (HACR)

• Bus control signal select register (EPCR)

Initial value

Address : 0000A5H

0011- - 00B

Initial value

Address : 0000A6H

********B

Initial value

Address : 0000A7H

1000*10 -B

−

: Write only

: Not used

: May be either “1” or “0”



bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

IOR0

IOR1

HMR1

HMR0



LMR1

LMR0

WWW

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

E22

E23

E21

E20

E19

E18

E17

E16



bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

RYE

CKE

HDE

IOBS

HMBS

WRE

LMBS



Access control

Address control

Data control

P0 direction

P0 data

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