MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 236
MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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Real Time Clock (RTC)
Data Sheet
236
NOTE:
With compensation enabled, the RTC clock and calendar register
updates may not be synchronized to the timebase and chronograph
clocks, since their clocks are derived from the uncompensated
CGMXCLK.
Hence, time intervals for timebase ticks may not align with the RTC clock
and calendar register updates.
CHRCLR — Chronograph counter clear
CHRE — Chronograph Enable
RTCE — Real Time Clock Enable
TBH — Timebase High Frequency Select
Freescale Semiconductor, Inc.
Setting this write-only bit resets the chronograph counter and the
chronograph data register (CHRR). Setting CHRCLR has no effect on
any other registers. Counting resumes from $00. CHRCLR is cleared
automatically after the chronograph counter is reset and always reads
as logic 0. Reset clears the CHRCLR bit.
This read/write bit enables the chronograph counter. When the
chronograph counter is disabled (CHRE = 0), the value in the
chronograph data register is held at the count value. Reset clears the
CHRE bit.
This read/write bit enables the entire RTC module, allowing all RTC
and chronograph operations. Disabling the RTC module does not
affect the contents in the RTC registers. Reset clears the RTCE bit.
This read/write bit selects the timebase interrupt period for TB1 and
TB2. Reset clears the TBH bit.
For More Information On This Product,
1 = Chronograph counter cleared
0 = No effect
1 = Chronograph counter enabled
0 = Chronograph counter disabled
1 = RTC module enabled
0 = RTC module disabled
1 = TB1 interrupt is 0.125s; TB2 interrupt is 0.0625s
0 = TB1 interrupt is 0.5s; TB2 interrupt is 0.25s
Go to: www.freescale.com
Real Time Clock (RTC)
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
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