Datasheet

ST72321Rx ST72321ARx ST72321Jx
12/193
Notes:
1. 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,
else the configuration is floating interrupt input.
2. 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 See “I/O PORTS” on page 46. and Section 12.8 I/O PORT PIN CHARACTER-
45 - - PA2 I/O C
T
X ei0 X X Port A2
46 31 16 PA3 (HS) I/O C
T
HS X ei0 X X Port A3
47 32 - V
DD_1
S Digital Main Supply Voltage
48 33 - V
SS_1
S Digital Ground Voltage
49 34 17 PA4 (HS) I/O C
T
HS X XXXPort A4
50 35 - PA5 (HS) I/O C
T
HS X XXXPort A5
51 36 18 PA6 (HS)/SDAI I/O C
T
HS X TPort A6 I
2
C Data
1)
52 37 19 PA7 (HS)/SCLI I/O C
T
HS X TPort A7 I
2
C Clock
1)
53 38 20 V
PP
/ ICCSEL I
Must be tied low. In flash program-
ming mode, this pin acts as the pro-
gramming voltage input V
PP
. See
Section 12.9.2 for more details. High
voltage must not be applied to ROM
devices
54 39 21 RESET
I/O C
T
Top priority non maskable interrupt.
55 - - EVD External voltage detector
56 - - TLI I C
T
X Top level interrupt input pin
57 40 22 V
SS_2
S Digital Ground Voltage
58 41 23 OSC2
3)
I/O Resonator oscillator inverter output
59 42 24 OSC1
3)
I
External clock input or Resonator os-
cillator inverter input
60 43 25 V
DD_2
S Digital Main Supply Voltage
61 44 26 PE0/TDO I/O C
T
X X X X Port E0 SCI Transmit Data Out
62 1 27 PE1/RDI I/O C
T
X X X X Port E1 SCI Receive Data In
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 unbond-
ed pins (See note 4). It is recommend-
ed to configure it as output push pull
to avoid added current consumption.
64 - - PE3 I/O C
T
X XXXPort E3
Pin n°
Pin Name
Type
Level Port
Main
function
(after
reset)
Alternate function
LQFP64
LQFP44
LQFP32
Input
Output
Input Output
float
wpu
int
ana
OD
PP