MB90F482B datasheet(34/124 Pages) FUJITSU

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MB90480B/485B Series

DS07-13722-11E

(2) Port Direction Registers

*1 : The value is set to “

⎯” on MB90485B series only.

*2 : The initial value of this bit is “XX000000B” on MB90485B series only.

• When a set of pins is functioning as a port, the corresponding signal pins are controlled as follows.

0 : Input mode.

1 : Output mode. Reset to “0”.

Notes :

• When any of these registers are accessed using a read-modify-write type instruction (such as a bit set

instruction) , the bit specified in the instruction will be set to the indicated value. However, the contents

of output registers corresponding to any other bits having input settings will be rewritten to the input values

of those pins at that time.

For this reason, when changing any pin that has been used for input to output, first write the desired value

to the PDR register before setting the DDR register for output.

• P76, P77 (MB90485B series only)

This port has no DDR. To use P77 and P76 as I2C pins, set the PDR value to “1” so that port data remains

enabled (to use P77 and P76 for general purposes, disable I2C) . The port is an open drain output (with

no P-ch) .

To use it as an input port, therefore, set the PDR to “1” to turn off the output transistor and add a pull-up

resistor to the external output.

DDR0

Initial value

Access

Address : 000010H

00000000B

R/W

DDR1

Address : 000011H

00000000B

R/W

DDR2

Address : 000012H

00000000B

R/W

DDR3

Address : 000013H

00000000B

R/W

DDR4

Address : 000014H

00000000B

R/W

DDR5

Address : 000015H

00000000B

R/W

DDR6

Address : 000016H

00000000B

R/W

DDR7

Address : 000017H

00000000B*2

R/W

DDR8

Address : 000018H

00000000B

R/W

DDR9

Address : 000019H

00000000B

R/W

DDRA

Address : 00001AH

----0000B

R/W

D06

D07

D05

D04

D03

D02

D01

D00

D16

D17

D15

D14

D13

D12

D11

D10

D26

D27

D25

D24

D23

D22

D21

D20

D36

D37

D35

D34

D33

D32

D31

D30

D46

D47

D45

D44

D43

D42

D41

D40

D56

D57

D55

D54

D53

D52

D51

D50

D66

D67

D65

D64

D63

D62

D61

D60

D75

D74

D73

D72

D71

D70

D77*1

D76*1

D86

D87

D85

D84

D83

D82

D81

D80

D96

D97

D95

D94

D93

D92

D91

D90

⎯

⎯⎯

⎯

DA3

DA2

DA1

DA0

MB90F482B Scheda tecnica(PDF) 34 Page - fujitsu semiconductor

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