C8051F331 Silicon Laboratories Inc, C8051F331 Datasheet - Page 21

• Manufacturer Part Number: C8051F331
• Description: IC 8051 MCU 8K FLASH 20MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F331

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

1.5.
The C8051F330/1, C8051F330D Family includes an SMBus/I
enhanced baud rate configuration, and an Enhanced SPI interface. Each of the serial buses is fully imple-
mented in hardware and makes extensive use of the CIP-51's interrupts, thus requiring very little CPU
intervention.
1.6.
An on-chip Programmable Counter/Timer Array (PCA) is included in addition to the four 16-bit general pur-
pose counter/timers. The PCA consists of a dedicated 16-bit counter/timer time base with three program-
mable 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. The external clock source selection is useful for
real-time clock functionality, where the PCA is clocked by an external source while the internal oscillator
drives the system clock.
Each capture/compare module can be configured to operate in one of six modes: Edge-Triggered Capture,
Software Timer, High Speed Output, 8- or 16-bit Pulse Width Modulator, or Frequency Output. Additionally,
Capture/Compare Module 2 offers watchdog timer (WDT) capabilities. Following a system reset, Module 2
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.
Serial Ports
Programmable Counter Array
Capture/Compare
Figure 1.9. PCA Block Diagram
Module 0
SYSCLK/12
SYSCLK/4
Timer 0 Overflow
SYSCLK
External Clock/8
ECI
Crossbar
Port I/O
C8051F330/1, C8051F330D
Rev. 1.2
Capture/Compare
Module 1
CLOCK
MUX
PCA
16-Bit Counter/Timer
2
C interface, a full-duplex UART with
Capture/Compare
Module 2 / WDT
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