DS80C320-ECD DALLAS [Dallas Semiconductor], DS80C320-ECD Datasheet - Page 27

• Manufacturer Part Number: DS80C320-ECD
• Description: High-Speed Microcontroller User Guide
• Manufacturer: DALLAS [Dallas Semiconductor]

Port 1 (P1)
SFR 90h
P1.7-0
Bits 7-0
Bit 7
INT4
Bit 6
Bit 5
INT2
Bit 4
TXD1
Bit 3
RXD1
Bit 2
T2EX
Bit 1
T2
Bit 0
INT5
INT3
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
RW-0
INT5
P1.7
7
General Purpose I/O Port 1. This register functions as a general purpose I/O
port. In addition, all the pins have an alternative function listed below. P1.2-7
contain functions that are new to the 80C32 architecture. The Timer 2 functions
on pins P1.1-0 are available on the 80C32, but not the 80C31. Each of the
functions is controlled by several other SFRs. The associated Port 1 latch bit
must contain a logic one before the pin can be used in its alternate function
capacity.
External Interrupt 5. A falling edge on this pin will cause an external interrupt
5 if enabled.
External Interrupt 4. A rising edge on this pin will cause an external interrupt
4 if enabled.
External Interrupt 3. A falling edge on this pin will cause an external interrupt
3 if enabled.
External Interrupt 2. A rising edge on this pin will cause an external interrupt
2 if enabled.
Serial Port 1 Transmit. This pin transmits the serial port 1 data in serial port
modes 1, 2, 3 and emits the synchronizing clock in serial port mode 0.
Serial Port 1 Receive. This pin receives the serial port 1 data in serial port
modes 1, 2, 3 and is a bi-directional data transfer pin in serial port mode 0.
Timer 2 Capture/Reload Trigger. A 1 to 0 transition on this pin will cause the
value in the T2 registers to be transferred into the capture registers if enabled by
EXEN2 (T2CON.3). When in auto–reload mode, a 1 to 0 transition on this pin
will reload the timer 2 registers with the value in RCAP2L and RCAP2H if
enabled by EXEN2 (T2CON.3).
Timer 2 External Input. A 1 to 0 transition on this pin will cause timer 2
increment or decrement depending on the timer configuration.
RW-0
INT4
P1.6
6
RW-0
INT3
P1.5
5
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RW-0
INT2
P1.4
4
TXD1
RW-0
P1.3
3
High-Speed Microcontroller User’s Guide
RXD1
RW-0
P1.2
2
T2EX
RW-0
P1.1
1
RW-1
P1.0
T2
0