MB90583C datasheet(34/124 Pages) FUJITSU

34 / 124 page

MB90580C Series

s PERIPHERAL RESOURCES

I/O Ports

(1) Outline of I/O ports

When a data register serving for control output is read, the data output from it as a control output is read regardless

of the value in the direction register. Note that, if a read modify write instruction (such as a bit set instruction)

is used to preset output data in the data register when changing its setting from input to output, the data read

is not the data register latched value but the input data from the pin.

Ports 0 to 4 and 6 to A are input/output ports which serve as inputs when the direction register value is “0” or

as outputs when the value is “1”.

On the MB90580C series, ports 0 to 3 also serve as external bus pins. When the device is used in external bus

mode, therefore, these ports are restricted on use.

Ports 2 and 3 can be used as ports even in external bus mode depending on the setting of the corresponding

function select bit.

(2) Register configuration

(Continued)

•

Port 0 data register (PDR0)

bit

Address

: 000000H

Access

Initial value

•

Port 1 data register (PDR1)

bit

Address

: 000001H

Access

Initial value

•

Port 2 data register (PDR2)

bit

Address

: 000002H

Access

Initial value

•

Port 3 data register (PDR3)

bit

Address

: 000003H

Access

Initial value

•

Port 4 data register (PDR4)

bit

Address

: 000004H

Access

Initial value

(PDR1)

P07

P06

P05

P04

P03

P02

P01

P00

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

…………

(PDR0)

P17

P16

P15

P14

P13

P12

P11

P10

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

…………

(PDR3)

P27

P26

P25

P24

P23

P22

P21

P20

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

…………

(PDR2)

P37

P36

P35

P34

P33

P32

P31

P30

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

…………

(PDR5)

P47

P46

P45

P44

P43

P42

P41

P40

(R/W)

(X)

(RW)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

(R/W)

(X)

…………

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