MC68HC08LT8 Datasheet, PDF (13/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC08LT8 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.
1.2 Features
Features include:
• 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:
– 4-MHz at 5-V operating voltage
– 2-MHz at 3-V operating voltage
• Dual oscillator module
– 32.768kHz crystal oscillator
– 1 to 16MHz crystal oscillator
• 8,192 bytes user read-only memory (ROM) with security⁽¹⁾
• 128 bytes of on-chip random-access memory (RAM)
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture,
output compare, and pulse-width modulation (PWM) capability on each channel
• Programmable periodic interrupt (PPI)
• 4/3 backplanes and static with maximum 24/25 frontplanes liquid crystal display (LCD) driver
• Up to 38 general-purpose input/output (I/O) ports:
– 4 keyboard interrupt with internal pull up
– 2 × 15 mA high current sink pins
• System protection features:
– Optional computer operating properly (COP) reset
– Optional low-voltage detection with reset and selectable trip points for 3-V and 5-V 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
• 44-pin low-profile quad flat pack (LQFP)
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the ROM difficult for
unauthorized users.
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
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