General Description Introduction The MC68HC908JL8 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 MC68HC908JL8 include the following: • High-performance M68HC08 architecture • Fully upward-compatible object code with M6805, M146805, and M68HC05 Families • Low-power design; fully static with stop and wait modes • Maximum internal bus frequency: – 8-MHz at 5V operating voltage – 4-MHz at 3V operating voltage • Oscillator options: – Crystal or resonator – RC oscillator • 8,192 bytes user program FLASH memory with security(1) feature • 256 bytes of on-chip RAM • Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and PWM capability on each channel; external clock input option on TIM2 • 13-channel, 8-bit analog-to-digital converter (ADC) • Serial communications interface module (SCI) • 26 general-purpose input/output (I/O) ports: – 8 keyboard interrupt with internal pull-up – 11 LED drivers (sink) – 2 × 25mA open-drain I/O with pull-up • Resident routines for in-circuit programming and EEPROM emulation • System protection features: – Optional computer operating properly (COP) reset, driven by internal RC oscillator – Optional low-voltage detection with reset and selectable trip points for 3V and 5V operation – Illegal opcode detection with reset – Illegal address detection with reset • Master reset pin with internal pull-up and power-on reset • IRQ with schmitt-trigger input and programmable pull-up • 20-pin dual in-line package (PDIP), 20-pin small outline integrated package (SOIC), 28-pin PDIP, 28-pin SOIC, 32-pin shrink dual in-line package (SDIP), and 32-pin low-profile quad flat pack (LQFP) • Specific features of the MC68HC908JL8 in 28-pin packages are: – 23 general-purpose I/Os only – 7 keyboard interrupt with internal pull-up – 10 LED drivers (sink) – 12-channel ADC – Timer I/O pins on TIM1 only • Specific features of the MC68HC908JL8 in 20-pin packages are: – 15 general-purpose I/Os only – 1 keyboard interrupt with internal pull-up – 4 LED drivers (sink) – 10-channel ADC – Timer I/O pins on TIM1 only Features of the CPU08 include the following: • Enhanced HC05 programming model • Extensive loop control functions • 16 addressing modes (eight more than the HC05) • 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
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