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HP 811 OA Se
r
vice Guide
Th
e
M
icro
p
rocessor
B
oar
d
7-1 2
Fun
ctional Desc
r
i
p
tio
n
Th e MPU Board co ntro ls the HP 8110Α.
I
t receives data
f
rom Flash
EPR O Ms an d
b
atter y -backed Static RAM, the Keyb oard an d the
HP- ΙΒ inter face .
I
t communi cates wi th th e boards in th e instrument
thro ugh
t
he DBI ( De vice Bu s Interface . The MPU Board
i
s des igned
aro und th e MC68331 Micro processor .
Fi gure 7-3 show s th e fun ct ional uni ts inside the Microp rocessor and
how th ey relate to th e units on the Microp rocessor Board. These
have been numb ere d for eas y cross-re feren ce
b
et w een th e descrip tion
and the diagram .
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