C8051F360 datasheet(264/288 Pages) SILABS

264 / 288 page

C8051F360/1/2/3/4/5/6/7/8/9

264

Rev. 1.0

22. Programmable Counter Array

The Programmable Counter Array (PCA0) provides enhanced timer functionality while requiring less CPU

intervention than the standard 8051 counter/timers. PCA0 consists of a dedicated 16-bit counter/timer and

six 16-bit capture/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 Section “17.3. General Pur-

pose Port I/O” on page 190). The counter/timer is driven by a programmable timebase that can select

between six inputs as its source: 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 line. Each capture/compare module 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 is described in Section 22.2). The PCA is configured and controlled through the system con-

troller's Special Function Registers. The basic PCA block diagram is shown in Figure 22.1.

Important Note: The PCA Module 5 may be used as a watchdog timer (WDT), and is enabled in this mode

following a system reset. Access to certain PCA registers is restricted while WDT mode is enabled.

See Section 22.3 for details.

Capture/Compare

Module 1

Capture/Compare

Module 0

Capture/Compare

Module 2

Capture/Compare

Module 3

Crossbar

Port I/O

16-Bit Counter/Timer

PCA

CLOCK

MUX

SYSCLK/12

SYSCLK/4

Timer 0 Overflow

ECI

SYSCLK

External Clock/8

Capture/Compare

Module 4

Capture/Compare

Module 5

Figure 22.1. PCA Block Diagram

C8051F360 Datasheet(PDF) 264 Page - Silicon Laboratories

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