C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 235

• Manufacturer Part Number: C8051F320
• Description: IC 8051 MCU 16K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F320

• 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: 25
• 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 17x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

20.
The Programmable Counter Array (PCA0) provides enhanced timer functionality while requiring less CPU interven-
tion than the standard 8051 counter/timers. The PCA consists of a dedicated 16-bit counter/timer and five 16-bit cap-
ture/compare modules. Each capture/compare module has its own associated I/O line (CEXn) which is routed
through the Crossbar to Port I/O when enabled (See
details on configuring the Crossbar). The counter/timer is driven by a programmable timebase that can select between
six sources: system clock, system clock divided by four, system clock divided by twelve, the external oscillator clock
source divided by 8, Timer 0 overflow, or an external clock signal on the ECI input pin. Each capture/compare mod-
ule may be configured to operate independently in one of six modes: Edge-Triggered Capture, Software Timer, High-
Speed Output, Frequency Output, 8-Bit PWM, or 16-Bit PWM (each mode is described in
Compare Modules” on page
ity, allowing the PCA to be clocked by a precision external oscillator while the internal oscillator drives the system
clock. The PCA is configured and controlled through the system controller's Special Function Registers. The PCA
block diagram is shown in Figure 20.1
Important Note: The PCA Module 4 may be used as a watchdog timer (WDT), and is enabled in this mode follow-
ing a system reset. Access to certain PCA registers is restricted while WDT mode is enabled. See
details.
PROGRAMMABLE COUNTER ARRAY (PCA0)
Capture/Compare
Module 0
SYSCLK/12
Timer 0 Overflow
SYSCLK
External Clock/8
SYSCLK/4
ECI
237). The external oscillator clock option is ideal for real-time clock (RTC) functional-
Capture/Compare
Module 1
CLOCK
MUX
PCA
Crossbar
16-Bit Counter/Timer
Port I/O
Section “14.1. Priority Crossbar Decoder” on page 129
Capture/Compare
Figure 20.1. PCA Block Diagram
Rev. 1.1
Module 2
Capture/Compare
Module 3
C8051F320/1
Section “20.2. Capture/
Capture/Compare
Module 4 / WDT
Section 20.3
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