GENERAL DESCRIPTION
INTRODUCTION
The ST62T85B and ST62E85B devices are low cost members of the ST62xx 8-bit HCMOS family of microcontrollers, which is targeted at low to medium complexity applications. All ST62xx devices are based on a building block approach: a common core is surrounded by a number of on-chip peripherals.
The ST62E85B is the erasable EPROM version of the ST62T85B device, which may be used to emulate the ST62T85B device, as well as the respective ST6285B ROM devices.

■ 3.0 to 6.0V Supply Operating Range
■ 8 MHz Maximum Clock Frequency
■ -40 to +85°C Operating Temperature Range
■ Run, Wait and Stop Modes
■ 5 Interrupt Vectors
■ Look-up Table capability in Program Memory
■ Data Storage in Program Memory: User selectable size
■ Data RAM: 192 bytes
■ Data EEPROM: 128 bytes
■ User Programmable Options
■ 12 I/O pins, fully programmable as:
   – Input with pull-up resistor
   – Input without pull-up resistor
   – Input with interrupt generation
   – Open-drain or push-pull output
   – Analog Input
■ 4 I/O lines can sink up to 20mA to drive LEDs or TRIACs directly
■ One 8-bit Timer/Counter with 7-bit programmable prescaler
■ One 8-bit Autoreload Timer/Counter with 7-bit programmable prescaler and output compare
■ Digital Watchdog
■ 8-bit A/D Converter with 8 analog inputs
■ 8-bit Synchronous Peripheral Interface (SPI)
■ 8-bit Asynchronous Peripheral Interface (UART)
■ LCD driver with 40 segment outputs, 8 backplane outputs, 8 software selectable segment/backplane outputs and selectable multiplexing ratio.
■ On-chip Clock oscillator can be driven by Quartz Crystal or Ceramic resonator
■ One external Non-Maskable Interrupt
■ ST6285-EMU2 Emulation and Development System (connects to an MS-DOS PC via a parallel port).