sae81c90 Infineon Technologies Corporation, sae81c90 Datasheet - Page 31

• Manufacturer Part Number: sae81c90
• Description: Standalone Full-can Controller
• Manufacturer: Infineon Technologies Corporation

Port Control Registers
These registers control the parallel ports P0 and P1 which are provided in the SAE 81C90.
The Port Direction Registers PxPDR select each port pin separately for input (PxPDR.n=’0’) or
output (PxPDR.n=’1’). After reset the ports are switched as inputs.
P1PDR
Address: 2C
Reset Value: 00
P0PDR
Address: 28
Reset Value: 00
The Port Latch Registers PxLR store the output data for those port pins that are switched to
output.
P1LR
Address: 2E
Reset Value: 00
P0LR
Address: 2A
Reset Value: 00
The Port Pin Registers PxPR provide the current level of the port pins. These registers can only
be read.
P1PR
Address: 2D
Reset Value: 00
P0PR
Address: 29
Reset Value: 00
In parallel to the standard CMOS structure there are additional internal pullup devices of about
10...200 k at each port pin.
Note: Registers PxPDR and PxPL may be used for general purpose storage if the ports are not
Semiconductor Group
used.
H
H
H
H
H
H
H
H
H
H
H
H
P1PD.7 P1PD.6 P1PD.5 P1PD.4 P1PD.3 P1PD.2 P1PD.1 P1PD.0
P0PD.7 P0PD.6 P0PD.5 P0PD.4 P0PD.3 P0PD.2 P0PD.1 P0PD.0
P1L.7
P0L.7
P1P.7
P0P.7
rw
rw
rw
rw
7
7
7
7
7
7
07Feb95@09:05h Intermediate Version
r
r
P1P.6
P0P.6
P1L.6
P0L.6
rw
rw
rw
rw
6
6
6
6
6
6
r
r
P1P.5
P0P.5
P1L.5
P0L.5
rw
rw
rw
rw
5
5
5
5
5
5
r
r
30
P1L.4
P0L.4
P1P.4
P0P.4
rw
rw
rw
rw
4
4
4
4
4
4
r
r
P1P.3
P0P.3
P1L.3
P0L.3
rw
rw
rw
rw
3
3
3
3
3
3
r
r
P1P.2
P0P.2
P1L.2
P0L.2
rw
rw
rw
rw
2
2
2
2
2
2
r
r
SAE 81C90/91
P1L.1
P0L.1
P1P.1
P0P.1
rw
rw
rw
rw
1
1
1
1
1
1
r
r
P1P.0
P0P.0
P1L.0
P0L.0
rw
rw
rw
rw
0
0
0
0
0
0
r
r