Rainbow Electronics W90N745CDG User Manual
Page 323
W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
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319
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Revision
A2
BITS
DESCRIPTION
[31:20] RESERVED
-
[19:16]
PUPEN0
GPIO3 -GPIO0 port pin internal pull-up resister enable
There are 4 bits for this register, the corresponding bit is set to “1”
will enable pull-up resister on IO pin.
1 = enable
0 = disable
After power on the pull-up resisters are disabled.
NOTE: GPIO4 is used as AC97 BITCLK input, an IO pad with
Schmitt trigger input buffer PDB04SDGZ is implemented for this
pin. Due to TSMC IO library without pull-up register, an external
pull-up resister is necessary.
[15:5] RESERVED
[4:0]
OMDEN0
GPIO4 ~GPIO0 output mode enable
1 = output mode
0 = input mode
NOTE: Output mode enable bits are valid only when bit
PT0CFG4-0 is configured as general purpose I/O mode.
Each port pin can be enabled individually by setting the
corresponding control bit.
GPIO Port0 Data Output Register (GPIO_DATAOUT0)
REGISTER ADDRESS
R/W
DESCRIPTION
RESET
VALUE
GPIO_DATAOUT0 0xFFF8_3008 R/W GPIO
port0 data output register
0x0000_0000
31
30
29
28
27
26
25
24
RESERVED
23
22
21
20
19
18
17
16
RESERVED
15
14
13
12
11
10
9
8
RESERVED
7
6
5
4
3
2
1
0
RESERVED DATAOUT0
BITS
DESCRIPTION
[31:5] RESERVED -
[4:0]
DATAOUT0
PORT0 data output value
Writing data to this register will reflect the data value on the
corresponding port0 pin when it is configured as general purpose
output pin. And writing data to reserved bits is not effective.