
I/O ports ST72321xx-Auto
72/243 Doc ID 13829 Rev 1
Figure 29. I/O port general block diagram
Table 29. I/O port mode options
Configuration mode Pull-up P-buffer
Diodes
to V
DD
to V
SS
Input
Floating with/without Interrupt Off
Off
On
On
Pull-up with/without Interrupt On
Output
Push-pull
Off
On
Open-drain (logic level) Off
True open-drain NI NI NI
(1)
1. 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 device against positive stress.
Legend:
Off - Implemented not activated
On - Implemented and activated
NI - Not implemented
DR
DDR
OR
DATA BUS
PAD
V
DD
ALTERNATE
ENABLE
ALTERNATE
OUTPUT
1
0
OR SEL
DDR SEL
DR SEL
PULL-UP
CONDITION
P-BUFFER
(see table below)
N-BUFFER
PULL-UP
(see table below)
1
0
ANALOG
INPUT
If implemented
ALTERNATE
INPUT
V
DD
DIODES
(see table below)
EXTERNAL
SOURCE (ei
x
)
INTERRUPT
CMOS
SCHMITT
TRIGGER
REGISTER
ACCESS
Komentáře k této Příručce