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ST6373 Folha de dados(PDF) 33 Page - STMicroelectronics

Nome de Peças ST6373
Descrição Electrónicos  8-BIT ROM/OTP/EPROM MCUs FOR DIGITALLY CONTROLLED MULTISYNC/MULTISTANDARD MONITORS
PDF  64 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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ST6373 Folha de dados(HTML) 33 Page - STMicroelectronics

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I/O PORTS (Cont’d)
4.1.2.1 Port C I/O Pin Programming
Each Port C pin can be individually programmed
as input or output. This is achieved by writing to
the relevant bit in the data (DRC) and data direc-
tion register (DDRC). Table 9 shows all the port
configurations that can be selected by the user
software.
4.1.2.2 Port C Input/Output Configurations
The following schematics show the I/O lines hard-
ware configuration for the different options. Figure
31 shows the I/O configuration for an I/O pin with
open-drain 12V capability (standard drive and high
drive). Figure 32 shows the I/O configuration for an
I/O pin with open-drain 5V capability.
Note:
All the Port A, B and C I/O lines have Schmitt-trig-
ger input configuration with a typical hysteresis of
1V.
Table 10. I/O Port Options Selection (Port C)
Note: X. Means don’t care.
Figure 22. I/O Configuration Diagram
(Open Drain 12V)
Figure 23. I/O Configuration Diagram (Open Drain 5V)
DDR
DR
Mode
Option
0
0
Input
With on-chip pull-up resistor
0
1
Input
Without on-chip pull-up resistor
1
X
Output
Open-drain
VA00342
I/O
N
In
Out
I/O HIGH DRIVE, OPEN DRAIN 12V
(5mA, 1V)
DD
V
Out
In
N
I/O (OPEN-DRAIN, 5V)
VA00345A
OPEN-DRAIN OUTPUT
In Input mode only, SW programmable ( 200k )
*
*
~



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