MC68HC908LJ24 Datasheet, PDF (222/464 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Real Time Clock (RTC)
CALOUT
1 Hz
CALIN
REFERENCE
CLOCK CALIBRATION
AND
COMPENSATION CIRCUIT
CGMXCLK
÷ 256
÷2
÷2
÷2
(32.768 kHz)
× ²⁵ + ¹⁶
32 32
1/100 SECONDS
CHRONOGRAPH DATA REGISTER
ALARM MINUTE REGISTER
COMPARATOR
1 Hz
TO CLOCK
COUNTERS
TBH = 0 => X,Y = A
TBH
TBH = 1 => X,Y = B
SL
2 Hz
÷2
÷2
÷2
X_{A X}
4Hz _YA
8 Hz
16 Hz
X_{B Y}
Y_B
TB1F
TB1IE
TB2F
TB2IE
128 Hz
CHRF
CHRONOGRAPH COUNTER
CHRIE
CHRE CHRCLR
FROM CLOCK
COMPENSATION CIRCUIT
1 Hz
SECF
SECOND COUNTER REGISTER
SECIE
MINF
MINIE
INTERRUPT
LOGIC
ALARM HOUR REGISTER
COMPARATOR
MINUTE COUNTER REGISTER
HOUR COUNTER REGISTER
DAY-OF-WEEK COUNTER REGISTER
DAY COUNTER REGISTER
HRF
HRIE
ALMF
ALMIE
DAYF
DAYIE
MONTH COUNTER REGISTER
YEAR COUNTER REGISTER
Data Sheet
222
Figure 12-2. RTC Block Diagram
MC68HC908LJ24/LK24 — Rev. 2
Real Time Clock (RTC)
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