Philips P89LPC907 用户手册

2003 Dec 8     

50

RTCS1-0 cannot be changed if the RTC is currently enabled (RTCCON.0 =1). Setting RTCEN and updating RTCS1-0 may be 
done in a single write to RTCCON. However, if RTCEN = 1, this bit must first be cleared before updating RTCS1-0

If ERTC (RTCCON.1), EWDRT (IEN0.6) and EA (IEN0.7) are set to ’1’, RTCF can be used as an interrupt source. This interrupt 
vector is shared with the watchdog timer. It can also be a source to wake up the device.

Only power-on reset will reset the Real-time Clock and its associated SFRs to their default state.

1

0

0

00

WDT Oscillator/DIVM

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01

10

11

WDT Oscillator/DIVM 

(CCLK)

1

0

1

xx

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1

0

1

1

1