Agilent Technologies 8453 Operator's Manual page 140

Figure 6
4 control
LEDs
8-bit
switch
HPIB
driver
CAN
driver
APG
remot-
e
GPIO
driver
RS232
driver
multicell
transport
driver
Theory of Operation
Spectrophotometer Processor Main (SPM) Board
Spectrophotometer Processor Main (SPM)
Board
SPM Board
SPM
ASIC
application
specific
integrated
circuit
main
microprocessor
serial bus
SSP
spectra and
signal processor
SSP bus
ASIC
SIMM
memory
module
34
LEDs and switches
PWM
driver
sense
battery
memory
real time
clock
control lines
serial bus
RAM
shutter
fan
MPS
mainpower
supply