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M851 WristApp Design Guide Rev 1.2
Timex Corporation 2
2 M851 Hardware
This section defines the hardware components in the M851 Watch.
2.1 Microcontroller
The microcontroller of the M851 is the EPSON 88349. It is an 8-bit microcontroller having 48Kbytes of
ROM and 2Kbytes of RAM. It has built in hardware components to attached external devices like I/O
ports, serial port, LCD, timers, etc. The operating system and a number of internal applications are masked
in ROM.
2.2 LCD
This serves as the information window of the watch. There are four regions in the viewing area:
Regions Description
Icons Unique icons (12) that can be used to shows status of system and
application.
Upper Dot-Matrix An 11 x 5 dot matrix area. Able to display 2 characters in either
fixed or proportional fonts.
Segment Regions Allows for the display of 6-digit segmented digits.
Main Dot Matrix An 42 x 11 dot matrix area. Able to display characters in either
fixed or proportional fonts, large and regular size.
Two lines are available for writing in this area when using the
regular sized fonts.
2.3 Switches
The system provides eigth switches whose functionality and use is defined by the user interface. The
kernel sends out switch activity to the foreground application through system events for processing.