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CHAPTER 5 I/O PORT
5.2

I/O Port Registers

This section describes the configuration and functions of the I/O port registers.
■ Port Data Registers (PDR)
The configuration of the port data registers (PDR) is shown below:
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
Address :
PDR0 to PDRP are I/O data registers for the I/O ports. I/O is controlled by the corresponding DDR2 to
DDRP and PFR6 to PFRP.
There is no port function register (PFR) for P20 to P27, P30 to P37, P40 to P47, P50 to P57, P91, PJ0 to
PJ7, PK0 to PK7, PG0, PG3, PH0, PH3, PI0, PI3, PM1, or PM3.
*: The MB91F353A/351A/352A/353A do not have PDRs that are PDRB, PDRC, PDRG, PDRJ, and
PDRP. Also, the bit values of P65, P66, P67, P92, PN1, PN3, PN5, P01, P03, P04, P05, P06, and P07
are invalid.
234
7
6
PDR2
P27
P26
P25
00000002
H
7
6
PDR3
P37
P36
P35
00000003
H
7
6
PDR4
P47
P46
P45
00000004
H
7
6
PDR5
P57
P56
P55
00000005
H
7
6
PDR6
*P67 *P66 *P65
00000006
H
7
6
PDR8
P85
00000008
H
7
6
PDR9
00000009
H
7
6
PDRA
0000000A
H
7
6
*
PDRB
*PB7 *PB6 *PB5 *PB4 *PB3 *PB2 *PB1 *PB0
0000000B
H
7
6
*
PDRC
0000000C
H
7
6
*
PDRG
*PG5 *PG4 *PG3 *PG2 *PG1 *PG0
00000010
H
7
6
PDRH
PH5
00000011
H
7
6
PDRI
PI5
00000012
H
7
6
*
PDRJ
*PJ7
*PJ6
*PJ5
00000013
H
7
6
PDRK
PK7
PK6
PK5
00000014
H
7
6
PDRL
00000015
H
7
6
PDRM
PM5
00000016
H
PDRN
7
6
*PN5
00000017
H
PDR0
7
6
*P07 *P06 *P05 *P04 *P03
00000018
H
7
6
*
PDRP
00000019
H
5
4
3
2
1
P24
P23
P22
P21
5
4
3
2
1
P34
P33
P32
P31
5
4
3
2
1
P44
P43
P42
P41
5
4
3
2
1
P54
P53
P52
P51
5
4
3
2
1
P64
P63
P62
P61
5
4
3
2
1
P84
P83
P82
P81
5
4
3
2
1
P94
P93
*P92
P91
5
4
3
2
1
PA3
PA2
PA1
5
4
3
2
1
5
4
3
2
1
*PC2 *PC1 *PC0
5
4
3
2
1
5
4
3
2
1
PH4
PH3
PH2
PH1
5
4
3
2
1
PI4
PI3
PI2
PI1
5
4
3
2
1
*PJ4
*PJ3
*PJ2
*PJ1
5
4
3
2
1
PK4
PK3
PK2
PK1
5
4
3
2
1
PL1
5
4
3
2
1
PM4
PM3
PM2
PM1
5
4
3
2
1
PN4
*PN3
PN2
*PN1
5
4
3
2
1
P02
*P01
5
4
3
2
1
*PP3 *PP2 *PP1 *PP0
0
Initial value
Access
R/W
P20
XXXXXXXX
B
0
Initial value
Access
R/W
P30
XXXXXXXX
B
0
Initial value
Access
R/W
P40
XXXXXXXX
B
0
Initial value
Access
P50
R/W
XXXXXXXX
B
0
Initial value
Access
P60
R/W
XXXXXXXX
B
0
Initial value
Access
P80
- - XXXXXX
R/W
B
0
Initial value
Access
R/W
P90
- - - XXXXX
B
0
Initial value
Access
R/W
PA0
- - - - XXXX
B
0
Initial value
Access
R/W
XXXXXXXX
B
0
Initial value
Access
R/W
- - - - - XXX
B
0
Initial value
Access
R/W
- - XXXXXX
B
0
Initial value
Access
R/W
PH0
- - XXXXXX
B
0
Initial value
Access
R/W
PI0
- - XXXXXX
B
0
Initial value
Access
R/W
*PJ0
XXXXXXXX
B
0
Initial value
Access
R/W
PK0
XXXXXXXX
B
0
Initial value
Access
PL0
R/W
- - - - - - XX
B
0
Initial value
Access
PM0
R/W
- - XXXXXX
B
0
Initial value
Access
R/W
PN0
- - XXXXXX
B
0
Initial value
Access
P00
R/W
XXXXXXXX
B
0
Initial value
Access
R/W
XXXXXXXX
B

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