C8051F020 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F020

8K ISP FLASH MCU Family

Silicon Laboratories 

C8051F020/1/2/3

23.2.3. High Speed Output Mode

In High Speed Output mode, a module’s associated CEXn pin is toggled each time a match occurs between the PCA

Counter and the module's 16-bit capture/compare register (PCA0CPHn and PCA0CPLn) Setting the TOGn, MATn,

and ECOMn bits in the PCA0CPMn register enables the High-Speed Output mode.

Important Note About Capture/Compare Registers: When writing a 16-bit value to the PCA0 Capture/Compare

registers, the low byte should always be written first. Writing to PCA0CPLn clears the ECOMn bit to ‘0’; writing to

PCA0CPHn sets ECOMn to ‘1’.

Figure 23.6. PCA High Speed Output Mode Diagram

Write to

PCA0CPLn

0

ENB

Reset

Write to

PCA0CPHn ENB

1

PCA0CPMn

P ECCMT P E

WCA A AOWC

MOPP TGMC

1 MPN n n n F

6nnn

n

n

x 00

0x

PCA Interrupt

PCA0CPLn PCA0CPHn

PCA0CN

CC CCCCC

FR CCCCC

FFFFF

43210

Enable

16-bit Comparator

PCA

Timebase

PCA0L

PCA0H

Match

Toggle

0

1

TOGn

0 CEXn Crossbar

1

Port I/O

Rev. 1.4

255

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