參數(shù)資料
型號: MB90F481PFV
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, LQFP-100
文件頁數(shù): 22/101頁
文件大小: 1063K
代理商: MB90F481PFV
MB90480 Series
27
(2) Port Direction Registers
*1 : The port of MB90V480 is “-”
*2 : The initial value of MB90V480 is “--000000”.
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”.
The Port 76 and 77 of MB90V480 :
No DDR for this port. As this port is open-drain output style, so when using this port as an input port, in order
to turn off the output transistor, set the output data resister value to “1” and add the pull up resister to the
external pin.
Note : When any of these register 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.
DDR0
Initial 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
*2
R/W
DDR8
Address : 000018H
00000000
R/W
DDR9
Address : 000019H
00000000
R/W
DDRA
Address : 00001AH
- - - - 0000
R/W
76
5
4
3
2
1
0
D06
D07
D05
D04
D03
D02
D01
D 00
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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