ST52T410 datasheet(12/84 Pages) STMICROELECTRONICS

12 / 84 page

ST52T410/T420/E420

12/84

1.3 Pin Description

VDD, VSS, VDDA, GNDA, VPP. In order to avoid

noise disturbances, the power supply of the digital

part is kept separate from the power supply of the

analog part.

VDD. Main Power Supply Voltage (5V± 10%).

In the ST52x410 version the two VDD pins must be

connected togheter.

VSS. Digital circuit ground.

In the ST52x410 version the two VSS pins must be

connected togheter.

VDDA.Analog VDD of the AnalogtoDigital

Converter.

GNDA. Analog VSS of the Analog to Digital

Converter. Must be tied to VSS.

VPP. Main Power Supply for internal EPROM

(12.5V

±5%, in programming phase) and Operating

MODE selector. During the Programming phase

(programming), VPP must be set at 12V. In the

Working phase VPP must be equal to VSS.

OSCin and OSCout. These pins are internally

connected with the on-chip oscillator circuit. A

quartz crystal or a ceramic resonator can be

connected between these two pins in order to allow

the correct operations of ST52T410/ST52x420

with various stability/cost trade-off. An external

clock signal can be applied to OSCin, in this case

OSCout must be floating.

RESET. This signal is used to restart ST52T410/

ST52x420 at the beginning of its program and to

select the program mode for EPROM.

Ain0-Ain7. These 8 lines are connected to the

input of the analog multiplexer. They allow the

acquisition of 8 analog input (ST52x420 only).

During the Programming phase, Ain0, Ain1, Ain2

and Ain3 are used to manage EPROM operation.

PA0-PA7, PB0-PB7, PC0-PC3. These lines are

organized as I/O port. Each pin can be configured

as input or output. PA7/PB7 are tied to the same

output. During Programming phase PA port is used

for EPROM read/write data.

T0RES, T0CLK, T0STRT. These pins are related

with the internal Programmable Timer/PWM 0.

This Timer can be reset externally by using

T0RES. In Working Mode, T0RES resets the

address counter of the Timer. T0RES is active at

low level.

TheTimer 0Clock canbethe internal clock orcan

be supplied externally by using pin T0CLK.

An external Start/Stop signal can be used to

control the Timer through T0STRT pin.

T0OUT, T1OUT, T2OUT. T he T IM ER/PWM

outputs are available on these pins.

T0OUT , T1OUT , T2OUT .T he T IM ER/PWM

complementary outputs are available on these

pins.

TEST. During the Programming and Working

phase it must be set to Vss.

INT. This pin is used to start the External Interrupt

routine.

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