MC908LJ24CFUE Freescale Semiconductor, MC908LJ24CFUE Datasheet - Page 225

IC MCU 24K FLASH 8MHZ SPI 64-QFP

MC908LJ24CFUE

Manufacturer Part Number
MC908LJ24CFUE
Description
IC MCU 24K FLASH 8MHZ SPI 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908LJ24CFUE

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, IRSCI, SPI
Peripherals
LCD, LVD, POR, PWM
Number Of I /o
40
Program Memory Size
24KB (24K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Processor Series
HC08LJ
Core
HC08
Data Bus Width
8 bit
Data Ram Size
768 B
Interface Type
SCI/SPI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
48
Number Of Timers
4
Operating Supply Voltage
3.3 V, 5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
FSICEBASE, M68EML08LJLKE, ZK-HC08LX-A, M68CBL05CE
Minimum Operating Temperature
- 40 C
On-chip Adc
6-ch x 10-bit
Controller Family/series
HC08
No. Of I/o's
40
Ram Memory Size
768Byte
Cpu Speed
8MHz
No. Of Timers
2
Embedded Interface Type
I2C, SCI, SPI
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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12.7 RTC Clock Calibration and Compensation
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
The RTC module is built with a calibration and compensation circuit for
the CGMXCLK. The circuit is used to compensate frequency errors of
the 32.768kHz crystal so that a more accurate 1-Hz RTC clock can be
achieved. Using this method, it is possible to use a less expensive
crystal. If the crystal temperature profile and the current temperature is
known, the calibration circuit can also be used to compensate crystal
frequency errors due to ambient temperature change and crystal aging.
The circuit provides a ±60ppm compensation range, which is suitable for
common 30ppm crystals, and can achieve a compensated RTC clock
accuracy between –3ppm and +2ppm.
The automatic calibration process works by comparing an external 1-Hz
(1ppm) signal driven into the CALIN pin, with the CGMXCLK signal
driven by the 32.768kHz crystal. The calibration is started by setting the
CAL bit followed by the AUTOCAL bit in the RTC calibration register
(RTCCOMR). During calibration, the tdiff block compares the time
difference between the two clock sources for 15 seconds. This time
difference is expressed in the number of CGMXCLK clock cycles and
stored in two’s complement format in the 6-bit E-register (the RTC
calibration data register, RTCCDAT).
CGMXCLK
CGMXCLK
(32.768-kHz)
CALIN
Figure 12-3. RTC Clock Calibration and Compensation
1-Hz REF
Real Time Clock (RTC)
÷ 983040
÷ 32766
÷ 32767
÷ 32768
÷ 32769
÷ 32770
÷ 30
1-Hz FROM
CGMXCLK ÷ 32768
COMPENSATED
1-Hz
RTC Clock Calibration and Compensation
tdiff
E-REGISTER
A
B
COMEN
1
S
EVOL
Real Time Clock (RTC)
1-Hz
RTC CLOCK
Data Sheet
225

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