C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 26

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F320/1
1.8.
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 five programmable capture/com-
pare 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 4 offers watchdog timer (WDT) capabilities. Following a system reset, Module 4 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.
26
Programmable Counter Array
Capture/Compare
Module 0
SYSCLK/12
Timer 0 Overflow
SYSCLK
External Clock/8
SYSCLK/4
ECI
Capture/Compare
Figure 1.9. PCA Block Diagram
Module 1
CLOCK
MUX
PCA
Crossbar
16-Bit Counter/Timer
Port I/O
Rev. 1.1
Capture/Compare
Module 2
Capture/Compare
Module 3
Capture/Compare
Module 4 / WDT