INTRODUCTION

The MC68HC11KW1 8-bit microcontroller is a member of the M68HC11 family of HCMOS

microcontrollers. It has 640 bytes of EEPROM and 768 bytes of RAM. Making use of a 100-pin

TQFP package, a non-multiplexed expanded bus is a feature of this device. The main timer system

includes three input captures, four output compares and a software selectable input capture or

output compare. There are two additional 16-bit timers, each with three output compares and one

software selectable input capture or output compare. Other major features of this device are: a

10-channel, 10-bit resolution A/D converter, four PWM timer channels, an SPI (serial peripheral

interface) and an enhanced SCI (serial communications interface). In common with other family

members, the MC68HC11KW1 also includes an 8-bit pulse accumulator circuit, a real time

interrupt facility, and a computer operating properly watchdog system. This device is intended for

use in expanded memory applications.

Features

• Low power, high performance M68HC11 CPU core with 4MHz internal bus frequency

• 768 bytes of RAM

• 640 bytes of byte-erasable EEPROM, with on-chip charge pump

• 448 bytes of boot ROM

• Up to 70 general purpose I/O lines, plus up to 10 input-only lines

• Non-multiplexed address and data buses, permitting direct access to the full 64K byte address

map

• Memory expansion unit, with six address extension lines, allowing up to (for example) sixteen

32K byte banks of external memory to be addressed in either of two bank windows

• Four external chip selects

• 16-bit timer with 3/4 input captures and 5/4 output compares; pulse accumulator and COP

watchdog timer

• Real-time interrupt circuit

• Two additional 16-bit timers, each with 3 output compares and one input capture or output

compare (may be externally clocked, if required, for external event counter operation)

• SCI subsystem (NRZ type for compatibility with standard RS232 systems) with parity and a

modulus prescaler

• SPI subsystem, with software selectable MSB/LSB first option and increased baud rate selection range

• 10-channel, 10-bit analog-to-digital converter

• Four 8-bit PWM timer channels

• Available in 100-pin TQFP package