Aug.2007

www.eorex.com

RTC timer, Base timer interrupt and Watch Dog timer

Address

03H

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

NAME UCCLK

#

BASE1

BASE0

RTC1

RTC0

RCSEL2

RCSEL1

RESEL0

Read or Write

W

W

W

W

W

W

W

W

Default Value

0

0

0

0

0

0

0

0

Real time counter

(CKSEL). Its frequency could be optioned by UCCLK.4 & UCCLK.3 that could select real time interrupt

frequency. For example, if the clock source come from ExCLK/PB3 (when CKSEL=1) and the input

frequency is 32,768Hz, select “[RTC1, RTC0] = [0, 1]” and it will cause 2Hz interrupt when real time

counter interrupt enabled (RTCINT=1) & (RTCEN=1).

RTC1

RTC0

0

0

0

1

1

0

1

1

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