Rainbow Electronics W79E8213R User Manual

Page 22

Preliminary W79E8213/W79E8213R Data Sheet

Publication Release Date: July 11, 2008

- 22 -

Revision A2

BIT NAME

FUNCTION

7-2 - Reserved.

P2.1

XTAL1 clock input pin.

P2.0

XTAL2 or CLKOUT pin by alternative.

Note: During power-on-reset, the port pins are tri-stated. After power-on-reset, the value of the port is set by CONFIG0.PRHI

bit. The default setting for CONFIG0.PRHI =1 which the alternative function output is turned on upon reset. If
CONFIG0.PRHI is set to 0, the user has to write a 1 to port SFR to turn on the alternative function output.

AUX FUNCTION REGISTER 1

Bit:

7 6 5 4 3 2 1 0

EDF BOD BOI LPBOV

SRST ADCEN

BUZE -

Mnemonic: AUXR1

Address: A2h

BIT NAME

FUNCTION

7 EDF

Edge detect Interrupt Flag:

1: When any pin of port 1.0-1.2 that is enabled for the Edge Detect Interrupt

function trigger (falling/rising edge trigger configurable). Must be cleared by
software.

6 BOD

Brown Out Disable:

0: Enable Brownout Detect function.

1: Disable Brownout Detect function and save power.

5 BOI

Brown Out Interrupt:

0: Disable Brownout Detect Interrupt function and it will cause chip reset when

BOF is set.

1: This prevents Brownout Detection from causing a chip reset and allows the

Brownout Detect function to be used as an interrupt.

4 LPBOV

Low Power Brown Out Detect control:

0: When BOD is enable, the Brown Out detect is always turned on by normal run

or Power-down mode.

1: When BOD is enable, the Brown Out detect circuit is turned on by Power-

down mode. This control can help save 15/16 of the Brownout circuit power.
When uC is in Power-down mode, the BOD will enable internal RC OSC
(600KHz+/- 50%)

3 SRST

Software reset:

1: reset the chip as if a hardware reset occurred.

2 ADCEN

0: Disable ADC circuit.

1: Enable ADC circuit.

1 BUZE

Square-wave enable bit:

0: Disable square wave output.

1: The square wave is output to the BUZ (P1.0) pin.

0 -

Reserved.