C8051F320 View Datasheet(PDF) - Unspecified

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C8051F320

Full Speed USB, 16k ISP FLASH MCU Family

Unspecified 

C8051F320/1

1.8. 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 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.

Figure 1.9. PCA Block Diagram

SYSCLK/12

SYSCLK/4

Timer 0 Overflow

ECI

SYSCLK

External Clock/8

PCA

CLOCK

MUX

16-Bit Counter/Timer

Capture/Compare

Module 0

Capture/Compare

Module 1

Capture/Compare

Module 2

Capture/Compare

Module 3

Capture/Compare

Module 4 / WDT

Crossbar

Port I/O

26

Rev. 1.1

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