XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 21

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

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1
INTRODUCTION
The MC68HC05F32 is a member of the M68HC05 family of HCMOS microcomputers. Its memory
configuration comprises 32K bytes of ROM, 920 bytes of RAM and 256 bytes of EEPROM. The
on-board features of this device make it particularly suitable for use in highly integrated telephone
handsets; the timer and DTMF generator allow for both pulse and tone dialling and, in addition to
telephone set-up parameters and features such as last number redial, the EEPROM can typically store
up to 12 telephone numbers of 20 digits, even after power has been removed from the circuit. Other
features of the device include the keyboard interrupt facility, which allows a direct interface to a
telephone keypad, the LCD circuit, which can drive up to 160 segments of an LCD display, and the A/D
converter which could be used, for example, as a volume control for a telephone in hands-free mode.
A high level of integration has been achieved on the MC68HC05F32 and careful attention has been
paid to its low-power and low-voltage performance, a major consideration in many telecommunications
applications.
The MC68HC05F32 is very well suited to automotive applications; with its 8 analog inputs and many
general I/O lines, it is especially useful in applications such as car dashboards. Also, the voltage levels
of the LCD driver can be varied using external resistors, and the timer system is capable of driving two
stepper motors (e.g. speedometer and odometer), as well as controlling a real time clock. The SCI
subsystem is ideal for interfacing to diagnostic equipment, for example, and the on-board EEPROM
can be used to store data such as mileage or calibration information.
This data sheet is structured such that devices similar to the MC68HC05F32 are described in a set of
appendices.
Table 1-1 Data sheet appendices
Device
Appendix
Differences from MC68HC05F32
MC68HC705F32
A
32256 bytes EPROM; 496 bytes boot ROM
TPG
MC68HC05F32
INTRODUCTION
MOTOROLA
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