C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 26
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
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
-
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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
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