
ST72321xx-Auto Package pinout and pin description
Doc ID 13829 Rev 1 25/243
Legend / Abbreviations for Tab le 3 :
Type: I = input
O = output
S = supply
Input level: A = dedicated analog input
In/Output level: C = CMOS 0.3V
DD
/0.7V
DD
C
T
= CMOS 0.3V
DD
/0.7V
DD
with input trigger
Output level: HS = 20mA high sink (on N-buffer only)
Port and control configuration:
● Input: float = floating
wpu = weak pull-up
int = interrupt
(a)
ana = analog
● Output: OD = open-drain
(b)
PP = push-pull
63 -
PE2
(Flash device)
I/O C
T
X
Port E2
Caution: In Flash devices this port
is always input with weak pull-up.
PE2
(ROM device)
X XX
Port E2
Caution: In ROM devices, no
weak pull-up present on this port.
In LQFP44 this pin is not
connected to an internal pull-up
like other unbonded pins. It is
recommended to configure it as
output push-pull to avoid added
current consumption.
64
-
PE3 I/O C
T
X XXXPort E3
1. It is mandatory to connect all available V
DD
and V
AREF
pins to the supply voltage and all V
SS
and V
SSA
pins to ground.
2. OSC1 and OSC2 pins connect a crystal/ceramic resonator or an external source to the on-chip oscillator; see Section 6:
Supply, reset and clock management and Section 19.5: Clock and timing characteristics on page 195 for more details.
Table 3. Device pin description (continued)
Pin No.
Pin name
Type
Level Port
Main
function
(after
reset)
Alternate function
LQFP64
LQFP44
Input
Output
Input Output
float
wpu
int
ana
OD
PP
a. In the interrupt input column, “eiX” defines the associated external interrupt vector. If the weak pull-up column
(wpu) is merged with the interrupt column (int), then the I/O configuration is pull-up interrupt input, otherwise
the configuration is floating interrupt input.
b. In the open-drain output column, “T” defines a true open-drain I/O (P-Buffer and protection diode to V
DD
are not
implemented). See Section 9: I/O ports on page 70 and Section 19.8: I/O port pin characteristics on page 203
for more details.
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