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MB90480 Datasheet(PDF) 34 Page - Fujitsu Component Limited.

Part No. MB90480
Description  16-bit Proprietary Microcontroller
Download  120 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90480 Datasheet(HTML) 34 Page - Fujitsu Component Limited.

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MB90480/485 Series
34
(2) Port Direction Registers
*1 : The value is set to “
⎯” on MB90485 series only.
*2 : The initial value of this bit is “XX000000B” on MB90485 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 (MB90485 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
76
5
4
3
21
0
D06
D07
D05
D04
D03
D02
D01
D00
D16
D17
D15
D14
D13
D12
D11
D10
76
5
4
3
2
1
0
76
5
4
3
2
1
0
D26
D27
D25
D24
D23
D22
D21
D20
76
5
4
3
2
1
0
D36
D37
D35
D34
D33
D32
D31
D30
76
5
4
3
2
1
0
D46
D47
D45
D44
D43
D42
D41
D40
76
5
4
3
2
1
0
D56
D57
D55
D54
D53
D52
D51
D50
76
5
4
3
2
1
0
D66
D67
D65
D64
D63
D62
D61
D60
76
5
4
3
2
1
0
D75
D74
D73
D72
D71
D70
D77*1
D76*1
76
5
4
3
2
1
0
D86
D87
D85
D84
D83
D82
D81
D80
76
5
4
3
2
1
0
D96
D97
D95
D94
D93
D92
D91
D90
76
5
4
3
2
1
0
⎯⎯
DA3
DA2
DA1
DA0


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