Product Details

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The MC68HC908JB8 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.

Features

Features of the MC68HC908JB8 include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• 3-MHz internal bus frequency
• 8,192 bytes of on-chip FLASH memory
• 256 bytes of on-chip random-access memory (RAM)
• FLASH program memory security1
• On-chip programming firmware for use with host PC computer
• Up to 37 general-purpose 3.3V input/output (I/O) pins, including:
– 13 or 10 shared-function I/O pins, depending on package
– 24, 8, or 2 dedicated I/O pins, depending on package
– 8 keyboard interrupts on port A, on all packages
– 10mA sink capability for normal LED on 4 pins
– 25mA sink capability for infrared LED on 2 pins
– 10mA sink capability for PS/2 connection on 2 pins(with USB module disabled)
• 16-bit, 2-channel timer interface module (TIM) with selectable input capture, output compare, PWM capability on each channel, and external clock input option (TCLK)
• Full Universal Serial Bus Specification 1.1 low-speed functions:
– 1.5 Mbps data rate
– On-chip 3.3V regulator
– Endpoint 0 with 8-byte transmit buffer and 8-byte receive buffer
– Endpoint 1 with 8-byte transmit buffer
– Endpoint 2 with 8-byte transmit buffer and 8-byte receive buffer
• System protection features:
– Optional computer operating properly (COP) reset
– Optional low-voltage detection with reset
– Illegal opcode detection with reset
– Illegal address detection with reset

Features of the CPU08 include the following:

• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC0
• 16-bit index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support