DS80C390_00 Datasheet, PDF (20/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

Port 1 (P1)
7
SFR 90h P1.7
INT5
RW-0
6
P1.6
INT4
RW-0
DS80C390 High-Speed Microcontroller User’s Guide Supplement
5
P1.7
INT3
RW-0
4
P1.4
INT2
RW-0
3
P1.3
TXD1
RW-0
2
P1.2
RXD1
RW-0
1
P1.1
T2EX
RW-0
0
P1.0
T2
RW-1
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
P1.7-0
Bits 7-0
INT5
Bit 7
INT4
Bit 6
INT3
Bit 5
INT2
Bit 4
TXD1
Bit 3
RXD1
Bit 2
T2EX
Bit 1
T2
Bit 0
General Purpose I/O Port 1. This register functions as the A0-A7 of the non-
multiplexed address bus (when the MUX pin=1) or a general purpose I/O port
(when the MUX pin=0). When serving as a general purpose I/O port 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.
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