MC68HC908LJ12 Datasheet, PDF (212/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Real Time Clock (RTC)
XTL[2:0]
CGMXCLK
÷ 64
VALID CGMXCLK
FREQUENCIES:
32.768 kHz
32.000 kHz
38.400 kHz
64.000 kHz
76.800 kHz
÷4
÷ 256 ₀₀₀
÷5
÷ 320 ₀₁₀
÷6
÷ 384 ₀₁₁
÷ 2 ^{÷ 640} 100/110
÷ 2 ^{÷ 768} 101/111
×
25
32
RTCE
×1
CHRONOGRAPH DATA REGISTER
XTL[2:0] = 000 => X = A
XTL[2:0] = 000 => X = B
X
÷ 32
A ^SL
X
÷2
÷2
÷ 25
B
100 Hz / 128 Hz
CHRONOGRAPH COUNTER
2 Hz
TB1F
TB1IE
4 Hz
TB2F
TB2IE
CHRF
CHRIE
CHRE CHRCLR
1 Hz
SECOND COUNTER REGISTER
SECF
SECIE
ALARM MINUTE REGISTER
COMPARATOR
MINF
MINIE
ALARM HOUR REGISTER
COMPARATOR
MINUTE COUNTER REGISTER
HOUR COUNTER REGISTER
DAY-OF-WEEK COUNTER REGISTER
DAY COUNTER REGISTER
HRF
HRIE
ALMF
ALMIE
DAYF
DAYIE
INTERRUPT
LOGIC
MONTH COUNTER REGISTER
YEAR COUNTER REGISTER
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor
Figure 12-2. RTC Block Diagram
Real Time Clock (RTC)
Technical Data
213