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ST6209CM6/XXX

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 20 PINS

STMicroelectronics 

ST62T08C/T09C ST62T10C/T20C/E20C

1.2 PIN DESCRIPTIONS

VDD and VSS. Power is supplied to the MCU via

these two pins. VDD is the power connection and

VSS is the ground connection.

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/VPP. The TEST must be held at VSS for nor-

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-PA3. These 4 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.

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. PB0-

PB3 can be used as analog input to the A/D con-

verter on the ST62T10C, T20C and E20C, while

PB4-PB7 can be used as analog inputs for the A/D

converter on the ST62T09C, T10C, T20C and

E20C.

Figure 2. ST62T08C,T09C, T10C, T20C and

E20C Pin Configuration

VDD 1

TIMER 2

OSCin 3

OSCout 4

NMI 5

VPP/TEST 6

RESET 7

Ain*/PB7 8

Ain*/PB6 9

Ain*/PB5 10

20 VSS

19 PA0/20 mA Sink

18 PA1/20 mA Sink

17 PA2/20 mA Sink

16 PA3/20 mA Sink

15 PB0/Ain*

14 PB1/Ain*

13 PB2/Ain*

12 PB3/Ain*

11 PB4/Ain*

*Analog input availability depend on device

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