Theory of Operation
A2 Processor Assembly
4-6 HP EPM-441A/442A Service Guide
of the control signals for the various peripherals. The crystal oscillator
clock circuit is buffered and distributed to the A4 interface assembly and
the A5 daughter assembly. The program memory for the microcontroller is
FLASH EEPROM to allow for in-circuit programming. The static RAM is
split into volatile and non-volatile blocks, with the power for the
non-volatile RAM being connected to the permanent (battery backed)
power supply.
4402serv.book Page 6 Monday, March 11, 2002 11:34 AM
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