12-BIT µP-COMPATIBLE
ANALOG-TO-DIGITAL CONVERTERS
1
TC7109
TC7109A
ADDRESS BUS
CONTROL BUS
DATA BUS
GND
ANALOG
IN
GND
MODE CE/LOAD
B9–B12
POL, OR
RUN/HOLD
TC7109A
B1–B8
HBEN
STATUS
LBEN
6
+5V
8
RD WR D7–D0
PA5–PA0
A0–A1
CS
8255
PB7–PB0 (MODE 0)
SEE TEXT PC5
87C48
8008, 8080,
8085, 8048, ETC.
Figure 14. Full-Time Parallel Interface to MCS-48, -80, -85 Microcomputers
ADDRESS BUS
CONTROL BUS
DATA BUS
GND
ANALOG
IN
GND
MODE CE/LOAD
B9–B12
POL, OR
6
RUN/HOLD
TC7109A
B1–B8
HBEN
STATUS
LBEN
8
STBA
1µF
10k Ω
RD WR D7–D0
PA5–PA0
PC6
PB7–PB0
8255
PC4
A0–A1
CS
87C48
8008, 8080,
8085, 8048, ETC.
INTRA
PC6
INTR
+5V
(SEE TEXT)
Figure 15. Full-Time Parallel Interface to MCS-48, -80, -85 Microcomputers With Interrupt
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4
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6
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8
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