C8051F970-A-GM Datasheet, PDF (279/454 Pages) Silicon Laboratories – Low Power Capacitive Sensing MCU with up to 32 kB of Flash

C8051F97x
26.2. 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 external interrupt
functions should be configured for digital I/O.
26.2.1. Assigning Port I/O Pins to Analog Functions
Table 26.1 shows all available analog functions that require port I/O assignments. Table 26.1 shows the potential
mapping of port I/O to each analog function.
Table 26.1. Port I/O Assignment for Analog Functions
Analog Function
Potentially Assignable Port Pins
QFN-48
QFN-32
QFN-28
SFR(s) used for
Assignment
ADC Input
P0.0 – P5.2
Capacitive Sense Input
P0.0 – P5.2
Voltage Reference (VREF)
P0.0
External Oscillator Input (XTAL1)
P1.0
External Oscillator Input (XTAL2)
P1.1
SmaRTClock Oscillator Input
(XTAL3)
SmaRTClock Oscillator Input
(XTAL4)
P0.6
P0.7
P0.0 – P3.2,
P5.2
P0.0 – P3.2,
P5.2
P0.0
P0.5
P0.6
P0.3
P0.4
P0.0 – P2.1,
P5.2
P0.0 – P2.1,
P5.2
P0.0
PnMDIN, AMUX0Pn,
Pn, ADC0 Registers
PnMDIN, AMUX0Pn,
Pn, CS0 Registers
REF0CN, PnSKIP, P0.0
bit set, PnMDIN
OSCXCN, AMUX0Pn
(cleared), Pn bit set,
PnMDIN
OSCXCN, AMUX0Pn
(cleared), P0.1 bit set,
PnMDIN
RTC0CN, AMUX0Pn
(cleared), P0.0 bit set,
PnMDIN
RTC0CN, AMUX0Pn
(cleared), P0.1 bit set,
PnMDIN
280
Rev 1.0