mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 222
mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
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Real Time Clock (RTC)
Data Sheet
222
(32.768kHz)
CGMXCLK
CALOUT
CALIN
REFERENCE
1Hz
1/100 SECONDS
÷ 256
CHRONOGRAPH DATA REGISTER
÷ 2
ALARM MINUTE REGISTER
ALARM HOUR REGISTER
COMPENSATION CIRCUIT
CLOCK CALIBRATION
COMPARATOR
COMPARATOR
÷ 2
×
AND
25
32
Figure 12-2. RTC Block Diagram
+
16
32
÷ 2
Real Time Clock (RTC)
÷ 2
1Hz
DAY-OF-WEEK COUNTER REGISTER
CHRE
SECOND COUNTER REGISTER
MINUTE COUNTER REGISTER
MONTH COUNTER REGISTER
HOUR COUNTER REGISTER
÷ 2
YEAR COUNTER REGISTER
CHRONOGRAPH COUNTER
DAY COUNTER REGISTER
128 Hz
TO CLOCK
COUNTERS
CHRCLR
÷ 2
16Hz
2Hz
4Hz
8Hz
FROM CLOCK
COMPENSATION CIRCUIT
1Hz
MC68HC908LJ24/LK24 — Rev. 2.1
X
Y
X
Y
A
A
B
B
TBH
SL
X
Y
TBH = 0 => X,Y = A
TBH = 1 => X,Y = B
SECIE
ALMIE
DAYIE
Freescale Semiconductor
SECF
MINIE
ALMF
DAYF
MINF
HRIE
HRF
CHRIE
TB1IE
TB2IE
CHRF
TB1F
TB2F
INTERRUPT
LOGIC
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