DS80C390_00 Datasheet, PDF (33/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

Port 5 (P5)
7
SFR A1h P5.7
PCE3
RW-1
DS80C390 High-Speed Microcontroller User’s Guide Supplement
6
P5.6
PCE2
RW-1
5
P5.5
PCE1
RW-1
4
P5.4
PCE0
RW-1
3
P5.3
C1TX
RW-1
2
P5.2
C1RX
RW-1
1
P5.1
C0RX
RW-1
0
P5.0
C0TX
RW-1
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
PCE3
Bit 7
PCE2
Bit 6
PCE1
Bit 5
PCE0
Bit 4
C1TX/TXD1
Bit 3
C1RX/RXD1
Bit 2
C0RX
Bit 1
C0TX
Bit 0
General Purpose I/O Port 5. This register functions as a general purpose
I/O port. In addition, all the pins have an alternate function listed below.
Each of the alternate functions is controlled by and/or influences other SFRs.
The associated Port 5 latch bit must contain a logic one before the pin can be
used in its alternate function capability.
Peripheral Chip Enable 3. When enabled via the P5CNT register, this pin
will assert the fourth chip enable signal.
Peripheral Chip Enable 2. When enabled via the P5CNT register, this pin
will assert the third chip enable signal.
Peripheral Chip Enable 1. When enabled via the P5CNT register, this pin
will assert the second chip enable signal.
Peripheral Chip Enable 0. When enabled via the P5CNT register, this pin
will assert the first chip enable signal.
CAN 1 Transmit / Serial Port 1 Transmit. This pin is connected to the
transmit data input pin of the CAN 1 transceiver device. Setting the Serial
Port 1 External Connection bit (SP1EC, P5CNT.5) configures this pin as the
Serial Port 1 transmit signal, disabling the corresponding CAN 1 function.
CAN 1 Receive / Serial Port 1 Receive. This pin is connected to the receive
data output pin of the CAN 1 transceiver device. Setting the Serial Port 1
External Connection bit (SP1EC, P5CNT.5) configures this pin as the Serial
Port 1 receive signal, disabling the corresponding CAN 1 function.
CAN 0 Receive. This pin is connected to the receive data output pin of the
CAN 0 transceiver device.
CAN 0 Transmit. This pin is connected to the transmit data input pin of the
CAN 0 transceiver device.
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