C8051F2XX Datasheet, PDF (19/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
WINDOWS OS
Silicon Labs Integrated
Development Environment
RS-232
SERIAL
ADAPTER
JTAG (x4), VDD, GND
VDD GND
TARGET PCB
C8051
F2XX
Figure 1.8. Degub Environment Diagram
1.4. Digital/Analog Configurable I/O
The standard 8051 Ports (0, 1, 2, and 3) are available on the device. The ports behave like standard 8051
ports with a few enhancements.
Each port pin can be configured as either a push-pull or open-drain output. Any input that is configured as
an analog input will have its corresponding weak pull-up turned off.
Digital resources (timers, SPI, UART, system clock, and comparators) are routed to corresponding I/O pins
by configuring the port multiplexer. Port multiplexers are programmed by setting bits in SFR's (please see
Section 14). Any of the 32 external port pins may be configured as either analog inputs or digital I/O (See
Figure 1.9), so effectively, all port pins are dual function.
Rev. 1.6
19