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ST72321AR6 Datasheet

  • ST72321AR6

  • 8-BIT MCU WITH NESTED INTERRUPTS, FLASH,10-BIT ADC, FIVE TIM...

  • STMicroelectronics   STMicroelectronics

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ST72321
I/O PORTS
(Cont鈥檇)
Figure 30. I/O Port General Block Diagram
REGISTER
ACCESS
ALTERNATE
OUTPUT
1
0
ALTERNATE
ENABLE
DR
V
DD
P-BUFFER
(see table below)
PULL-UP
(see table below)
V
DD
DDR
PULL-UP
CONDITION
If implemented
OR SEL
N-BUFFER
DDR SEL
CMOS
SCHMITT
TRIGGER
ANALOG
INPUT
DIODES
(see table below)
PAD
OR
EXTERNAL
INTERRUPT
SOURCE (ei
x
)
Table 9. I/O Port Mode Options
Configuration Mode
Input
Floating with/without Interrupt
Pull-up with/without Interrupt
Push-pull
Open Drain (logic level)
True Open Drain
Pull-Up
Off
On
Off
NI
P-Buffer
Off
On
Off
NI
On
On
Diodes
to V
DD
to V
SS
Output
Legend:
NI - not implemented
Off - implemented not activated
On - implemented and activated
DATA BUS
DR SEL
1
0
ALTERNATE
INPUT
NI (see note)
Note:
The diode to V
DD
is not implemented in the
true open drain pads. A local protection between
the pad and V
SS
is implemented to protect the de-
vice against positive stress.
47/185

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