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C8051T610/1/2/3/4/5/6/7
21.2. Assigning Port I/O Pins to Analog and Digital Functions
Port I/O pins can be assigned to various analog, digital, and external interrupt functions. The Port pins
assigned to analog functions should be configured for analog I/O, and Port pins assigned to digital or exter-
nal interrupt functions should be configured for digital I/O.
21.2.1. Assigning Port I/O Pins to Analog Functions
Table 21.1 shows all available analog functions that require Port I/O assignments. Port pins selected for
these analog functions should have their corresponding bit in PnSKIP set to 1. This reserves the pin
for use by the analog function and does not allow it to be claimed by the Crossbar. Table 21.1 shows the
potential mapping of Port I/O to each analog function.
Table 21.1. Port I/O Assignment for Analog Functions
Analog Function
ADC Input
Comparator Inputs
Voltage Reference (VREF0)
External Oscillator in RC or C Mode (EXTCLK)
Potentially Assignable
Port Pins
P1.0–P3.4
P1.0–P2.7
P0.0
P0.3
SFR(s) used for
Assignment
AMX0P, PnSKIP
CPT0MX, CPT1MX,
PnSKIP
REF0CN, PnSKIP
OSCXCN, PnSKIP
21.2.2. Assigning Port I/O Pins to Digital Functions
Any Port pins not assigned to analog functions may be assigned to digital functions or used as GPIO. Most
digital functions rely on the Crossbar for pin assignment; however, some digital functions bypass the
Crossbar in a manner similar to the analog functions listed above. Port pins used by these digital func-
tions and any Port pins selected for use as GPIO should have their corresponding bit in PnSKIP set
to 1. Table 21.2 shows all available digital functions and the potential mapping of Port I/O to each digital
function.
Table 21.2. Port I/O Assignment for Digital Functions
Digital Function
UART0, SPI0, SMBus, CP0,
CP0A, CP1, CP1A,
SYSCLK, PCA0 (CEX0-4
and ECI), T0 or T1.
Any pin used for GPIO
116
Potentially Assignable Port Pins
Any Port pin available for assignment by the
Crossbar. This includes P0.0 - P2.3 pins which
have their PnSKIP bit set to 0.
Note: The Crossbar will always assign UART0
pins to P0.4 and P0.5.
P0.0–P3.4
Rev 1.1
SFR(s) used for
Assignment
XBR0, XBR1
PnSKIP
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