st62t25c STMicroelectronics, st62t25c Datasheet - Page 5

• Manufacturer Part Number: st62t25c
• Description: 8-bit Otp/eprom Mcus With A/d Converter, Oscillator Safeguard, Safe Reset And 28 Pins
• Manufacturer: STMicroelectronics

1.2 PIN DESCRIPTIONS
V
these two pins. V
V
OSCin and OSCout. These pins are internally
connected to the on-chip oscillator circuit. A quartz
crystal, a ceramic resonator or an external clock
signal can be connected between these two pins.
The OSCin pin is the input pin, the OSCout pin is
the output pin.
RESET. The active-low RESET pin is used to re-
start the microcontroller. Internal pull-up is provid-
ed at this pin.
TEST/V
mal operation. If TEST pin is connected to a
+12.5V level during the reset phase, the EPROM
programming Mode is entered.
NMI. The NMI pin provides the capability for asyn-
chronous interruption, by applying an external non
maskable interrupt to the MCU. The NMI input is
falling edge sensitive. The user can select as op-
tion the availability of an on-chip pull-up at this pin.
TIMER. This is the timer I/O pin. In input mode it is
connected to the prescaler and acts as external
timer clock input or as control gate input for the in-
ternal timer clock. In output mode the timer pin out-
puts the data bit when a time-out occurs. The user
can select as option the availability of an on-chip
pull-up at this pin.
PA0-PA7. These 8 lines are organized as one I/O
port (A). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, interrupt generating inputs with pull-
up resistors, open-drain or push-pull outputs. PA0-
PA3 can also sink 20mA for direct LED driving
while PA4-PA7 can be programmed as analog in-
DD
SS
is the ground connection.
and V
PP
. The TEST must be held at V
SS
. Power is supplied to the MCU via
DD
is the power connection and
SS
for nor-
puts for the A/D converter.
PB0-PB7. These 8 lines are organized as one I/O
port (B). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, interrupt generating inputs with pull-
up resistors, open-drain or push-pull outputs, or as
analog inputs for the A/D converter.
PC4-PC7. These 4 lines are organized as one I/O
port (C). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, interrupt generating inputs with pull-
up resistors, open-drain or push-pull outputs, or as
analog inputs for the A/D converter.
Figure 2. ST62T15C,T25C and E25C Pin
V
PP
Ain/PC7
Ain/PC6
Ain/PC5
Ain/PC4
Ain/PB7
Ain/PB6
OSCout
Ain/PB5
RESET
TIMER
OSCin
/TEST
Configuration
V
NMI
DD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
ST62T15C/T25C/E25C
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
PA0/20mA Sink
PA1/20mA Sink
PA2/20mA Sink
PA3/20mA Sink
PA4/Ain
PA5/Ain
PA6/Ain
PA7/Ain
PB0/Ain
PB1/Ain
PB2/Ain
PB3/Ain
PB4/Ain
SS
5/70
5