Philips 8-bit microcontroller with two-clock 80C51 core UM10109 Manual De Usuario

 

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

This unit features:

A 16-bit timer with 16-bit reload on overflow

Selectable clock (CCUCLK), with a prescaler to divide the clock source by any integer 
between 1 and 1024.

Four Compare / PWM outputs with selectable polarity

Symmetrical / Asymmetrical PWM selection

Seven interrupts with common interrupt vector (one Overflow, 2xCapture, 
4xCompare), safe 16-bit read/write via shadow registers.

Two Capture inputs with event counter and digital noise rejection filter 

0

RTCEN

Real-time Clock enable. The Real-time Clock will be enabled if this bit is logic 1. 
Note that this bit will not power-down the Real-time Clock. The RTCPD bit 
(PCONA.7) if set, will power-down and disable this block regardless of RTCEN.

1

ERTC

Real-time Clock interrupt enable. The Real-time Clock shares the same interrupt 
as the watchdog timer. Note that if the user configuration bit WDTE (UCFG1.7) 
is logic 0, the watchdog timer can be enabled to generate an interrupt. Users 
can read the RTCF (RTCCON.7) bit to determine whether the Real-time Clock 
caused the interrupt. 

2:4

-

reserved

5

RTCS0

Real-time Clock source select (see 

6

RTCS1

7

RTCF

Real-time Clock Flag. This bit is set to logic 1 when the 23-bit Real-time Clock 
reaches a count of logic 0. It can be cleared in software.