MB90F474LPF datasheet(32/118 Pages) FUJITSU

32 / 118 page

MB90470 Series

(2) Port Direction Registers

• When a pin is functioning as a port, the corresponding pin control setting is as follows :

0 : Input mode

1 : Output mode

The register value is “0” at reset.

• Port 76, 77

These ports do not have DDR registers. Data at these pins is always valid, so that when P76, P77 are used

as I2C pins the PDR value should be “1”. (The I2C functions should be stopped, when these pins are used as

P76,P77 .)

These ports have open drain configuration. If they are used as input ports, the output transistor is turned off,

so that the output data register must be set to “1” and pull-up resistance applied.

Note : If these registers are accessed using read-modify-write instructions (such as bit set instructions) ,the bit that

is the object of the instruction will be set to the specified value but for other bits the value of the corresponding

output register will be rewritten to the input value of the pin at that time. For this reason when a pin used for

input is switched to output, first write the desired value to the PDR register, then set the DDR register to

switch the pin direction.

DDR0

Default value

Access

Address : 000010H

00000000

R/W

DDR1

Address : 000011H

00000000

R/W

DDR2

Address : 000012H

00000000

R/W

DDR3

Address : 000013H

00000000

R/W

DDR4

Address : 000014H

00000000

R/W

DDR5

Address : 000015H

00000000

R/W

DDR6

Address : 000016H

00000000

R/W

DDR7

Address : 000017H

00000000

R/W

DDR8

Address : 000018H

00000000

R/W

DDR9

Address : 000019H

00000000

R/W

DDRA

Address : 00001AH

- - - - 0000

R/W

D06

D07

D05

D04

D03

D02

D01

D 00

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

D86

D87

D85

D84

D83

D82

D81

D80

D96

D97

D95

D94

D93

D92

D91

D90







DA3

DA2

DA1

DA0

MB90F474LPF Arkusz danych(PDF) 32 Page - fujitsu semiconductor

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