Tadpole SPARCbook 3 series, Reference Manual

Page: 27 / 216

Architecture Overview
1-15
Microcontroller Subsystem
The modem supports a number of high level functions. It implements
DTMF dialing, call progression, and is controlled via an enhanced “AT”
command set. The data standards supported include V.22 bis, V.23, V.32,
V.32 bis, V.42, and V.42 bis. In addition, the modem provides send and
receive Fax capabilities to Group 3 standards (at up to 14,400bps).
1.14 Microcontroller Subsystem
The microcontroller subsystem provides system housekeeping support,
freeing the main CPU. A Hitachi H8/337 microcontroller is used, offering
the following features:
The microcontroller subsystem performs the following functions:
• Internal keyboard and pointing device control
• External keyboard and mouse control
• Serial communication channels to SLAVIO keyboard and mouse ports
• PSU and battery energy management
• System non-volatile storage (RTC and serial EEPROM)
• Environmental parameter control (display brightness and audio
volume)
• LCD status display (2 x 16 character) control
• System reset control
• Power management control
S3GX_TRMBook Page 15 Friday, September 19, 1997 11:39 am