MC68HC05L28 Datasheet, PDF (19/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer

1
1
INTRODUCTION
The MC68HC05L28 is a flexible general-purpose microcomputer, particularly suited to
applications throughout the consumer and automotive industries. It is a member of the highly
successful Motorola M68HC05 family of microcomputers and includes many of the standard
features of this family. Its hardware includes 8K of ROM, 240 bytes of EEPROM and 256 bytes of
RAM, plus a multi-master I²C interface, an A/D converter and an LCD driver subsystem.
The LCD subsystem is particularly flexible and can be programmed to drive a wide range of
industry-standard LCD devices — making the MC68HC05L28 particularly suited to many
applications in radio, TV and compact disc systems.
The MC68HC05L28’s communications, A/D and LCD modules and its two timer modules provide
the perfect combination for car dashboard applications, where analog signals from speed and
distance sensors have to be converted to digital signals before being processed and displayed.
The MC68HC705L28 is an EPROM equivalent version of the MC68HC05L28, with 8K of EPROM
instead of 8K of ROM. All references to the MC68HC05L28 apply equally to the MC68HC705L28,
unless otherwise noted. References specific to the MC68HC705L28 are italicized in the text and
also, for quick reference, they are summarised in Appendix A.
1.1
Features
• Fully static chip design featuring the industry standard M68HC05 core
• Multi-master I²C-bus^† communication port
• 8176 bytes of user ROM (MC68HC05L28); 8128 bytes of user EPROM (MC68HC705L28)
• 240 bytes of EEPROM
• 240 bytes of bootstrap ROM
• 256 bytes of RAM
† I²C-bus is a proprietary Philips interface bus
MC68HC05L28
INTRODUCTION
TPG
MOTOROLA
1-1