C8051F850-C-GM Datasheet, PDF (25/328 Pages) Silicon Laboratories – Low-Cost 8-bit MCU Family with up to 8 kB of Flash

2. System Overview
The C8051F85x/86x device family are fully integrated, mixed-signal system-on-a-chip MCUs. Highlighted
features are listed below. Refer to Table 4.1 for specific product feature selection and part ordering
numbers.
Core:
Pipelined CIP-51 Core
Fully compatible with standard 8051 instruction set
70% of instructions execute in 1-2 clock cycles
25 MHz maximum operating frequency
Memory:
2-8 kB flash; in-system programmable in 512-byte sectors
512 bytes RAM (including 256 bytes standard 8051 RAM and 256 bytes on-chip XRAM)
Power:
Internal low drop-out (LDO) regulator for CPU core voltage
Power-on reset circuit and brownout detectors
I/O: Up to 18 total multifunction I/O pins:
All pins 5 V tolerant under bias
Flexible peripheral crossbar for peripheral routing
5 mA source, 12.5 mA sink allows direct drive of LEDs
Clock Sources:
Low-power internal oscillator: 24.5 MHz ±2%
Low-frequency internal oscillator: 80 kHz
External CMOS clock option
Timers/Counters and PWM:
3-channel Programmable Counter Array (PCA) supporting PWM, capture/compare and frequency output
modes
4x 16-bit general-purpose timers
Independent watchdog timer, clocked from low frequency oscillator
Communications and Other Digital Peripherals:
UART
SPI™
I²C / SMBus™
16-bit CRC Unit, supporting automatic CRC of flash at 256-byte boundaries
Analog:
12-Bit Analog-to-Digital Converter (ADC)
2 x Low-Current Comparators
On-Chip Debugging
With on-chip power-on reset, voltage supply monitor, watchdog timer, and clock oscillator, the C8051F85x/
86x devices are truly standalone system-on-a-chip solutions. The flash memory is reprogrammable in-
circuit, providing non-volatile data storage and allowing field upgrades of the firmware.
The on-chip debugging interface (C2) allows non-intrusive (uses no on-chip resources), full speed, in-
circuit debugging using the production MCU installed in the final application. This debug logic supports
inspection and modification of memory and registers, setting breakpoints, single stepping, and run and halt
commands. All analog and digital peripherals are fully functional while debugging.
Each device is specified for 2.2 to 3.6 V operation, and are available in 20-pin QFN, 16-pin SOIC or 24-pin
QSOP packages. All package options are lead-free and RoHS compliant. The device is available in two
temperature grades: -40 to +85 °C or –40 to +125 °C. See Table 4.1 for ordering information. A block
diagram is included in Figure 2.1.
Rev. 1.0
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