![](http://datasheet.mmic.net.cn/330000/MB90P234_datasheet_16438148/MB90P234_20.png)
MB90230 Series
20
I
I/O MAP
(Continued)
Address
Register
Register
name
Access
Resouce
name
Initial value
00
H
Port 0 data register
PDR0
R/W
Port 0
XXXXXXXX
01
H
Port 1 data register
PDR1
R/W
Port 1
XXXXXXXX
02
H
Port 2 data register
PDR2
R/W
Port 2
XXXXXXXX
03
H
Port 3 data register
PDR3
R/W
Port 3
XXXXXXXX
04
H
Port 4 data register
PDR4
R/W
Port 4
XXXXXXXX
05
H
Port 5 data register
PDR5
R/W
Port 5
XXXXXXXX
06
H
Port 6 data register
PDR6
R/W
Port 6
XXXXXXXX
07
H
Port 7 data register
PDR7
R/W
Port 7
– XXXXXXX
08
H
Port 8 data register
PDR8
R/W
Port 8
XXXXXXXX
09
H
Port 9 data register
PDR9
R/W
Port 9
– XXXXXXX
0A
H
Port A data register
PDRA
R/W
Port A
– – XXXXXX
10
H
Port 0 direction register
DDR0
R/W
Port 0
0 0 0 0 0 0 0 0
11
H
Port 1 direction register
DDR1
R/W
Port 1
0 0 0 0 0 0 0 0
12
H
Port 2 direction register
DDR2
R/W
Port 2
0 0 0 0 0 0 0 0
13
H
Port 3 direction register
DDR3
R/W
Port 3
0 0 0 0 0 0 0 0
14
H
Port 4 direction register
DDR4
R/W
Port 4
0 0 0 0 0 0 0 0
15
H
Port 5 direction register
DDR5
R/W
Port 5
0 0 0 0 0 0 0 0
16
H
Port 6 direction register
DDR6
R/W
Port 6
0 0 0 0 0 0 0 0
17
H
Port 7 direction register
DDR7
R/W
Port 7
– 0 0 0 0 0 0 0
18
H
Port 8 direction register
DDR8
R/W
Port 8
0 0 0 0 0 0 0 0
19
H
Port 9 direction register
DDR9
R/W
Port 9
– 0 0 0 0 0 0 0
1A
H
Port A direction register
DDRA
R/W
Port A
– – 0 0 0 0 0 0
1B
H
Port 0 resistor register
RDR0
R/W
Port 0
0 0 0 0 0 0 0 0
1C
H
Port 1 resistor register
RDR1
R/W
Port 1
0 0 0 0 0 0 0 0
1D
H
Port 2 resistor register
RDR2
R/W
Port 2
0 0 0 0 0 0 0 0
1E
H
Port 9 pin register
ODR9
R/W
Port 9
– 0 0 0 – – – –
1F
H
Port A pin register
ODRA
R/W
Port A
– – 0 0 0 0 0 0
20
H
Mode control register
UMC
R/W
UART
0 0 0 0 0 1 0 0
21
H
Status register
USR
R/W
0 0 0 1 0 0 0 0
22
H
Serial input register
/Serial output register
UIDR
/UODR
R/W
XXXXXXXX
23
H
Rate and data register
URD
R/W
0 0 0 0 – – 0 0
24
H
Serial mode control status register
SMCS
R/W
Extended serial
I/O interface
– – – 0 0 0 0 0
25
H
0 0 0 0 0 0 1 0