Details

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BUY MC68HC908LJ24CFQ https://www.utsource.net/itm/p/8974419.html
IC MCU 8BIT 24KB FLASH 80QFP

Parameter	Description	Value
Part Number	Device Identifier	MC68HC908LJ24CFQ
Package Type	Package Style	28-pin LQFP (Leadless Quad Flat Package)
Operating Temperature	Range of temperatures where the device can operate safely	-40°C to +85°C
Supply Voltage (VDD)	Operating voltage range	2.7 V to 5.5 V
Clock Frequency	Maximum clock frequency for CPU operation	16 MHz
Flash Memory	Non-volatile memory for program storage	24 KB
RAM	Volatile memory for data storage	1 KB
Data EEPROM	Non-volatile memory for data storage	256 bytes
I/O Ports	Number of general-purpose input/output pins	20
Analog-to-Digital Converter (ADC)	Number of ADC channels and resolution	8 channels, 10-bit
Timers	Number and type of timers	2 x 8-bit, 1 x 16-bit
Serial Communication Interfaces (SCI)	Number of SCI interfaces	1
Synchronous Serial Interface (SPI)	Number of SPI interfaces	1
Interrupt Sources	Number of interrupt sources	16
Watchdog Timer (WDT)	Presence and type of watchdog timer	Yes, programmable
Low-Voltage Detection (LVD)	Feature to detect low supply voltage	Yes
Power-On Reset (POR)	Automatic reset when power is applied	Yes
Brown-Out Reset (BOR)	Reset when supply voltage drops below a threshold	Yes
Programming Interface	Method for programming the flash memory	In-System Programming (ISP)
Package Dimensions	Physical size of the package	7 mm x 7 mm

Instructions for Use

1. Power Supply:

   • Connect the VDD pin to the positive supply voltage (2.7 V to 5.5 V).
   • Connect the VSS pin to the ground (GND).

2. Clock Configuration:

   • Use an external crystal or resonator for the clock source, or configure the internal oscillator.
   • Connect the crystal or resonator to the X1 and X2 pins.

3. Reset:

   • Apply a low signal to the RESET pin to reset the microcontroller.
   • The microcontroller has built-in POR and BOR features to ensure proper initialization.

4. Programming:

   • Use the ISP interface to program the flash memory.
   • Connect the programming hardware to the appropriate pins (PAG, PCK, PDI, PDO).

5. I/O Configuration:

   • Configure the I/O ports using the appropriate registers.
   • Set the direction of the pins (input or output) using the DDRx registers.

6. ADC Operation:

   • Initialize the ADC by setting up the control registers.
   • Select the channel and start the conversion using the appropriate commands.

7. Timer Setup:

   • Configure the timers using the timer control registers.
   • Set the prescaler, period, and mode of operation.

8. Serial Communication:

   • Initialize the SCI or SPI interface by setting up the control registers.
   • Configure the baud rate, data format, and other parameters as needed.

9. Interrupt Handling:

   • Enable the desired interrupts by setting the corresponding bits in the interrupt enable register.
   • Write the interrupt service routines (ISRs) to handle the interrupts.

10. Watchdog Timer:

    • Enable the WDT by setting the appropriate bit in the control register.
    • Service the WDT periodically to prevent a reset.

11. Low-Voltage Detection:

    • Enable the LVD feature to monitor the supply voltage.
    • Set the threshold voltage and configure the response (e.g., reset or interrupt).

12. Development Tools:

    • Use development tools such as CodeWarrior or other IDEs to write and debug your code.
    • Utilize the debugger to step through the code and inspect variables.

For detailed information, refer to the datasheet and application notes provided by the manufacturer.

(For reference only)