ST6246 Просмотр технического описания (PDF) - STMicroelectronics

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ST6246

8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

STMicroelectronics 

ST62T46B/E46B

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.

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

mal operation (an internal pull-down resistor se-

lects normal operating mode if TEST pin is not

connected). If TEST pin is connected to a +12.5V

level during the reset phase, the EPROM/OTP

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 with Schmitt trigger charac-

teristics. The user can select as option the availa-

bility of an on-chip pull-up at this pin.

PA4-PA7. These 4 lines are organised as one I/O

port (A). Each line may be configured under soft-

ware control as inputs with or without internal pull-

up resistors, input with interrupt generation and

pull-up resistor, open-drain or push-pull outputs, or

as analog inputs for the A/D converter.

PB0...PB7. These 8 lines are organised as one I/O

port (B). Each line may be configured under soft-

ware control as inputs with or without internal pull-

up resistors, input with interrupt generation and

pull-up resistor, open-drain or push-pull outputs,

analog inputs for the A/D converter. PB0..PB3 can

be used as analog inputs for the A/D converter ,

while PB7/Sout, PB6/Sin and PB5/Scl can be used

respectively as data out, data in and Clock pins for

the on-chip SPI. In addition, PB4..PB7 can sink

20mA for direct LED or TRIAC drive.

PC0-PC7. These 8 lines are organised as one I/O

port (C). Each line may be configured under soft-

ware control as input with or without internal pull-

up resistor, input with interrupt generation and

pull-up resistor, open-drain or push-pull output, or

as LCD segment output S33..S40.

COM1-COM4. These four pins are the LCD pe-

ripheral common outputs. They are the outputs of

the on-chip backplane voltage generator which is

used for multiplexing the 45 LCD lines allowing up

to 180 segments to be driven.

S9..S16, S25..S43. These pins are the 27 LCD pe-

ripheral segment outputs. S33..S40 are alternate

functions of the Port C I/O pins. (Combiports fea-

ture)

VLCD. Display voltage supply. It determines the

high voltage level on COM1-COM4 and S4-S48

pins.

VLCD1/3, VLCD2/3. Display supply voltage inputs

for determining the display voltage levels on

COM1-COM4 and S4-S48 pins during multiplex

operation.

PSS. This is the Power Supply Supervisor sensing

pin. When the voltage applied to this pin is falling

below a software programmed value the highest

priority (NMI) interrupt can be generated. This pin

has to be connected to the voltage to be super-

vised.

OSC32in and OSC32out. These pins are inter-

nally connected with the on-chip 32kHz oscillator

circuit. A 32.768kHz quartz crystal can be con-

nected between these two pins if it is necessary to

provide the LCD stand-by clock and real time inter-

rupt. OSC32in is the input pin, OSC32out is the

output pin.

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