MC68HC05L16 Datasheet, PDF (13/146 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC05L16 is an 80-pin microcontroller unit (MCU) with highly sophisticated on-chip peripheral
functions. The memory map includes 16 Kbytes of user ROM and 512 bytes of RAM. The MCU has five
parallel ports: A, B, C, D, and E. The MC68HC05L16 includes a timebase circuit, 8- and 16-bit timers, a
computer operating properly (COP) watchdog timer, liquid crystal display (LCD) drivers, and a simple
serial peripheral interface (SSPI).
1.2 Features
Features of the MC68HC05L16 MCU include:
• Low-cost HC05 core
• 16,400 Bytes of mask ROM, including 16 bytes of user vectors and 512 bytes of on-chip RAM
• 16 bidirectional input-output (I/O) lines
• Eight input-only lines
• 15 output-only lines, including 8-bit key wakeup interrupts
• Pullup resistors options
• Open-drain outputs options
• Two interrupt request (IRQ) inputs
• 16-bit timer with input capture and output compare (timer 1)
• 8-bit event counter/modulus clock divider (timer 2)
• Simple serial peripheral interface (SSPI)
• LCD drivers — 1-to-4 backplane drivers x 27-to-39 frontplane drivers
• On-chip timebase circuits with COP watchdog timer and timebase interrupts
• Dual oscillators and selectable system clock frequency
• Power-saving stop mode and wait mode
• 80-pin quad flat pack (QFP)
1.3 MCU Structure
Figure 1-1 shows the structure of the MC68HC05L16 MCU.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
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