GENERAL DESCRIPTION
INTRODUCTION
The ST62T46B and ST62E46B devices are low cost members of the ST62xx 8-bit HCMOS family of microcontrollers, which are 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 ST62E46B is the erasable EPROM version of the ST62T46B device, which may be used to emulate the ST62T46B device, as well as the respective ST6246B ROM devices.
OTP and EPROM devices are functionally identical. The ROM based versions offer the same functionality selecting as ROM options the options defined in the programmable option byte of the OTP/EPROM versions.OTP devices offer all the advantages of user programmability at low cost, which make them the ideal choice in a wide range of applications where frequent code changes, multiple code versions or last minute programmability are required.
These compact low-cost devices feature two Timers comprising an 8-bit counter and a 7-bit programmable prescaler, EEPROM data capability, a serial synchronous port interface (SPI), an 8-bit A/D Converter with 8 analog inputs, a Digital Watchdog timer, and a complete LCD controller driver, making them well suited for a wide range of automotive, appliance and industrial applications.

■ 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: 128 bytes
■ Data EEPROM: 128 bytes
■ User Programmable Options
■ 20 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
   – LCD segments (8 combiport lines)
■ 4 I/O lines can sink up to 20mA to drive LEDs or TRIACs directly
■ Two 8-bit Timer/Counter with 7-bit programmable prescaler
■ Digital Watchdog
■ 8-bit A/D Converter with 8 analog inputs
■ 8-bit Synchronous Peripheral Interface (SPI)
■ LCD driver with 27 segment outputs, 4 backplane outputs and selectable multiplexing ratio.
■ 32kHz oscillator for stand-by LCD operation
■ Power Supply Supervisor (PSS)
■ On-chip Clock oscillator can be driven by Quartz Crystal or Ceramic resonator
■ One external Non-Maskable Interrupt
■ ST6240-EMU2 Emulation and Development System (connects to an MS-DOS PC via a parallel port).