C8051F80x-83x
Table 23.1. Port I/O Assignment for Analog Functions
Analog Function
ADC Input
Comparator0 Input
CS0 Input
Voltage Reference (VREF0)
Ground Reference (AGND)
External Oscillator in Crystal Mode (XTAL1)
External Oscillator in RC, C, or Crystal Mode (XTAL2)
Potentially Assignable
Port Pins
P0.0–P1.7
P0.0–P1.7
P0.0–P1.7
P0.0
P0.1
P0.2
P0.3
SFR(s) used for
Assignment
ADC0MX, PnSKIP,
PnMDIN
CPT0MX, PnSKIP,
PnMDIN
CS0MX, CS0SS,
CS0SE, PnMDIN
REF0CN, P0SKIP,
PnMDIN
REF0CN, P0SKIP
OSCXCN, P0SKIP,
P0MDIN
OSCXCN, P0SKIP,
P0MDIN
23.2.2. 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.
function.
Rev. 1.0
141
SILABS [ SILICON LABORATORIES ]
