CDP1855 View Datasheet(PDF) - Intersil
Part Name
Description
View to exact match
CDP1855 Datasheet PDF : 15 Pages
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Y-----3---Y---X-2----3Y---X-1---2Z----X3----Z1----2---Z----1- = Z3Z2Z1 + X-Y----33---YX----22----YX----11-
CDP1855, CDP1855C
DATA BUS
8
CLOCK
8
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
YL CDP1855 YR
ZL
ZR
O.F.
C.I.
CE
CTL
8
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
YL CDP1855 YR
ZL
ZR
C.O.
C.I.
CE
CTL
8
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
VDD
YL CDP1855 YR
ZL
ZR
C.O.
C.I.
CE
CTL
EF1
BUS
MRD
TPB
CLEAR
N2
N1
N0
TO
CPU
MOST SIGNIFICANT
LEAST SIGNIFICANT
VDD
OR
I/O SELECT
FIGURE 5. CASCADING THREE MDU’s (CDP1855) IN AN 1800 SYSTEM WITH MDU’s BEING ACCESSED AS I/O PORTS IN
PROGRAMMING EXAMPLE
DATA BUS
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
YL CDP1855 YR
ZL
ZR
O.F.
C.I.
CE
CTL
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
YL CDP1855 YR
ZL
ZR
C.O.
C.I.
CE
CTL
VDD
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
YL CDP1855 YR
ZL
ZR
C.O.
C.I.
CE
CTL
CLOCK
EF1
BUS
MRD
TPB
CLEAR
N2
N1
N0
BUS RD/ STB CLR
WE
CN1
CN0
RA0
CLK
RA1
SHIFT
RA2
VDD
YL CDP1855 YR
ZL
ZR
C.O.
C.I.
CE
CTL
MOST SIGNIFICANT
FIGURE 6. CASCADING FOUR MDU’s (CDP1855)
LEAST SIGNIFICANT
4-57
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