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ST72411R 数据表(PDF) 28 Page - STMicroelectronics

部件名 ST72411R
功能描述  8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING
PDF  71 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST72411R 数据表(HTML) 28 Page - STMicroelectronics

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I/O PORTS (Cont’d)
Smartcard versus Standard I/Os
The Smartcard I/O ports differ from the standard I/
O ports in that they have a different power supply:
the output buffers and the input Schmitt trigger are
supplied by VSC_PWR for the Smartcard I/Os and
by VDD for the Standard I/Os. For Smartcard I/Os,
the Schmitt trigger is designed to guarantee output
levels compatible with VDD for VSC_PWR =5V or
3V.
Caution: When the SSS regulator is deactivated
(bit SSSEN=0), the Smartcard I/O ports cannot be
used correctly (VSC_PWR=VSS). In this case,
special care is required when manipulating exter-
nal interrupts: As Smartcard I/Os are always tied
to ground, they may mask interrupts on other I/O
lines of the same port.
Figure 21. I/O Block Diagram
Table 6. Port Mode Options
NI - not implemented
Off - implemented not activated
On - implemented and activated
DR
DDR
OR
PAD
VDD or VSC_PWR
ALTERNATE
ENABLE
ALTERNATE
OUTPUT
1
0
OR SEL
DDR SEL
DR SEL
INTERRUPT
PULL-UP
CONDITION
P-BUFFER
(OPTION*)
N-BUFFER
PULL-UP
(OPTION*)
1
0
* SEE TABLE BELOW
ANALOG
INPUT
If implemented
ALTERNATE
INPUT
VDD or VSC_PWR
DIODES
(OPTION*)
PULL-DOWN
CONDITION
Configura tion Mode
Pull-Up
P-Buffer
Diodes
Input
Floating
Off
Off
On
Pull-up with Interrupt
On
Output
Push-pull
Off
On
Open Drain (logic level)
Off
Push-pull with pull-up
On
On
Open Drain (logic level) with pull-up
Off
True Open Drain
NI



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