Port 1 (p1) – Maxim Integrated High-Speed Microcontroller Users Guide: Network Microcontroller Supplement User Manual
Page 32
High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
32
Port 1 (P1)
7
6
5
4
3
2
1
0
SFR 90h
P1.7
INT5
P1.6
INT4
P1.5
INT3
P1.4
INT2
P1.3
TXD1
P1.2
RXD1
P1.1
T2EX
P1.0
T2
RW-1
RW-1
RW-1
RW-1
RW-1
RW-1
RW-1
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. When serving as a general-purpose I/O port, all the pins have an alterna-
tive function as described later. P1.2–7 contains functions that are new to the 80C32 architecture. The
timer 2 functions on pins P1.1-0 are available on the 80C32, but not on the 80C31. Each of the functions
is controlled by several other SFRs. The associated port 1 latch bit must contain a logic 1 before the pin
can be used in its alternate function capacity.
External interrupt 5. A falling edge on this pin causes an external interrupt 5, if enabled.
External interrupt 4. A rising edge on this pin causes an external interrupt 4, if enabled.
External interrupt 3. A falling edge on this pin causes an external interrupt 3, if enabled.
External interrupt 2. A rising edge on this pin causes an external interrupt 2, if enabled.
Serial port 1 transmit. This pin transmits the serial port 1 data in serial port modes 1, 2, and 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, and 3, and is a
bidirectional data transfer pin in serial port mode 0.
Timer 2 capture/reload trigger. A 1-to-0 transition on this pin causes the value in the T2 registers to be
transferred into the capture registers, if enabled by EXEN2 (T2CON.3). When in autoreload mode, a 1-
to-0 transition on this pin reloads 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 causes timer 2 increment or decrement, depend-
ing on the timer configuration.
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