![](http://datasheet.mmic.net.cn/30000/MB90P553APF_datasheet_2367781/MB90P553APF_22.png)
MB90550A/550B Series
22
s I/O MAP
(Continued)
Address
Register name
Abbreviated
register name
Read/write
Resource name
Initial value
00H
Port 0 data register
PDR0
R/W
Port 0
XXXXXXXX
01H
Port 1 data register
PDR1
R/W
Port 1
XXXXXXXX
02H
Port 2 data register
PDR2
R/W
Port 2
XXXXXXXX
03H
Port 3 data register
PDR3
R/W
Port 3
XXXXXXXX
04H
Port 4 data register
PDR4
R/W
Port 4
XXXXXXXX
05H
Port 5 data register
PDR5
R/W
Port 5
_ _ 1 1 1 1 1 1
06H
Port 6 data register
PDR6
R/W
Port 6
XXXXXXXX
07H
Port 7 data register
PDR7
R/W
Port 7
XXXXXXXX
08H
Port 8 data register
PDR8
R/W
Port 8
XXXXXXXX
09H
Port 9 data register
PDR9
R/W
Port 9
XXXXXXXX
0AH
Port A data register
PDRA
R/W
Port A
_ _ _XXXXX
0BH to
0FH
(Disabled)
10H
Port 0 direction register
DDR0
R/W
Port 0
0 0 0 0 0 0 0 0
11H
Port 1 direction register
DDR1
R/W
Port 1
0 0 0 0 0 0 0 0
12H
Port 2 direction register
DDR2
R/W
Port 2
0 0 0 0 0 0 0 0
13H
Port 3 direction register
DDR3
R/W
Port 3
0 0 0 0 0 0 0 0
14H
Port 4 direction register
DDR4
R/W
Port 4
0 0 0 0 0 0 0 0
15H
(Disabled)
16H
Port 6 direction register
DDR6
R/W
Port 6
0 0 0 0 0 0 0 0
17H
Port 7 direction register
DDR7
R/W
Port 7
0 0 0 0 0 0 0 0
18H
Port 8 direction register
DDR8
R/W
Port 8
0 0 0 0 0 0 0 0
19H
Port 9 direction register
DDR9
R/W
Port 9
0 0 0 0 0 0 0 0
1AH
Port A direction register
DDRA
R/W
Port A
_ _ _ 0 0 0 0 0
1BH
Port 4 output pin register
ODR4
R/W
Port 4
0 0 0 0 0 0 0 0
1CH
Port 0 resistor setting register
RDR0
R/W
Port 0
0 0 0 0 0 0 0 0
1DH
Port 1 resistor setting register
RDR1
R/W
Port 1
0 0 0 0 0 0 0 0
1EH
(Disabled)
1FH
Analog input enable register
ADER
R/W
Port 6,
A/D converter
1 1 1 1 1 1 1 1
20H
Serial mode register
SMR
R/W
UART
0 0 0 0 0 0 0 0
21H
Serial control register
SCR
R/W
0 0 0 0 0 10 0
22H
Serial input data register /
serial output data register
SIDR/SODR
R/W
XXXXXXXX
23H
Serial status register
SSR
R/W
0 0 0 0 1 _ 0 0