C8051F912 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F912

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

Silicon Laboratories 

C8051F91x-C8051F90x

1.3. Serial Ports

The C8051F91x-C8051F90x Family includes an SMBus/I2C interface, a full-duplex UART with enhanced

baud rate configuration, and two Enhanced SPI interfaces. Each of the serial buses is fully implemented in

hardware and makes extensive use of the CIP-51's interrupts, thus requiring very little CPU intervention.

1.4. Programmable Counter Array

An on-chip Programmable Counter/Timer Array (PCA) is included in addition to the four 16-bit general

purpose counter/timers. The PCA consists of a dedicated 16-bit counter/timer time base with six

programmable capture/compare modules. The PCA clock is derived from one of six sources: the system

clock divided by 12, the system clock divided by 4, Timer 0 overflows, an External Clock Input (ECI), the

system clock, or the external oscillator clock source divided by 8. ‘F912 and ‘F902 devices also support a

SmaRTClock divided by 8 clock source.

Each capture/compare module can be configured to operate in a variety of modes: edge-triggered capture,

software timer, high-speed output, pulse width modulator (8, 9, 10, 11, or 16-bit), or frequency output.

Additionally, Capture/Compare Module 5 offers watchdog timer (WDT) capabilities. Following a system

reset, Module 5 is configured and enabled in WDT mode. The PCA Capture/Compare Module I/O and

External Clock Input may be routed to Port I/O via the Digital Crossbar.

SYSCLK/12

SYSCLK/4

Timer 0 Overflow

ECI

SYSCLK

PCA

CLOCK

MUX

16-Bit Counter/Timer

External Clock/8

SmaRTClock/8*

*Only available on ‘F912 and ‘F902 devices.

Capture/Compare

Module 0

Capture/Compare

Module 1

Capture/Compare

Module 2

Capture/Compare

Module 3

Capture/Compare

Module 4

Capture/Compare

Module 5 / WDT

Crossbar

Port I/O

Figure 1.6. PCA Block Diagram

22

Rev. 1.0

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