3 to 6.0V Supply Operating Range

8 MHz Maximum Clock Frequency

-25 to +85°C Operating Temperature Range

Run, Wait & Stop Modes

■ 5 different interrupt vectors

■ Look-up table capability in ROM

User ROM:

■ Data ROM:

3868 bytes

User selectable size

(in program ROM)

128 bytes

128 bytes

Data RAM:

■ EEPROM:

■ PDIP28, PSO28 packages

■ 21 fully software programmable I/O as:

- Input with pull-up resistor

- Input without pull-up resistor

- Input with interrupt generation

-Open-drain or push-pull outputs

-Analog Inputs

8 I/O lines can sink up to 20mA for direct LED or

TRIAC driving

■ 8 bit counter with a 7-bit programmable prescaler

(Timer1)

. 8 bit auto-reload timer with 7-bit programmable

prescaler (AR Timer)

■ Digital Watchdog

■ 8 bit A/D Converter with up to 13 analog inputs

▪ 8 bit Synchronous Peripheral Interface (SPI)

■ On-chip clock oscillator (Quartz Crystal or Ce-

ramic)

■ Power-on Reset

■ Clock output

■9 powerful addressing modes

■ The development tool of the ST6294 microcon-

trollers consists of the ST626x-EMU emulation

and development system connected via a stand-

ard RS232 serial line to an MS-DOS Personal

Computer

GENERAL DESCRIPTION

The ST6294 microcontroller is member of the 8-bit

HCMOS ST62xx family, a series of devices oriented

to low-medium complexity applications. All ST62xx

members are based on a building block approach: a

common core is surrounded by a combination of on-

chip peripherals (macrocells).

The macrocells of the ST6294 are: the Timer pe-

ripheral that includes an 8-bit counter with a 7-bit

software programmable prescaler (Timer1), the 8-

bit Auto-reload Timer with 7 bit programmable

prescaler (AR Timer), the 8-bit A/D Converter with

up to 13 analog inputs (A/D inputs are alternate

functions of I/O pins), the Digital Watchdog (DWD)

and an 8-bit Serial synchronous Peripheral Inter-

face (SPI). In addition, these devices offer 128

bytes of EEPROM for non volatile data storage.

The ST6294 is a version of the ST6265 specifically

tailored to be used in telephone set applications.

The only difference is that a CKOUT pin is provided

instead of the NMI pin. For this reason this

datasheet only contains information relating to the

differences to the ST6265, and thus should be read

in conjunction with the ST6265 datasheet. The

ST62E94 EPROM version is available for prototypes

and low-volume production; also OTP version is

available.