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ST72101 Datasheet(PDF) 26 Page - STMicroelectronics

Part # ST72101
Description  8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72101 Datasheet(HTML) 26 Page - STMicroelectronics

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ST72101/ST72212/ST72213
I/O PORTS (Cont’d)
Figure 20
. I/O Block Diagram
Table 10. Port Mode Configuration
Legend:
0 -
present, not activated
1 -
present and activated
Notes:
– No OR Register on some ports (see register map).
– ADC Switch on ports with analog alternate functions.
DR
DDR
LATCH
LATCH
DR SEL
DDR SEL
VDD
PAD
ANALOG
SWITCH
ANALOG ENABLE
(ADC)
M
U
X
ALTERNATE
ALTERNATE
ALTERNATE ENABLE
ALTERNATE
M
U
X
ALTERNATE INPUT
PULL-UP
OUTPUT
P-BUFFER
(SEE TABLE BELOW)
N-BUFFER
1
0
1
0
OR
LATCH
OR SEL
FROM
OTHER
BITS
EXTERNAL
PULL-UP
CONDITIO N
ENABLE
ENABLE
GND
(SEE TABLE BELOW)
(SEE NOTE BELOW)
CMOS
SCHMITT TRIGGER
SOURCE (EIx)
INTERRUPT
POLARITY
SEL
GND
VDD
DIODE
(SEE TABLE BELOW)
Configu ration Mode
Pull-up
P-buffer
VDD Diode
Floating
0
0
1
Pull-up
1
0
1
Push-pull
0
1
1
True Open Drain
not present
not present
not present in OTP
and EPROM devices
Open Drain (logic level)
0
0
1
26


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