Product folder

EM6620 (obsolete, replaced by EM6625/26) Ultra-low power MCU with integrated 4x8 LCD driver.

Contents:   •  Datasheet   •  General description   •  Features   •  Applications notes   •  Errata   •  Demo Program

Datasheet DataSheet 858 Kb

General description

The EM6620 is an advanced single chip CMOS 4-bit microcontroller. It contains ROM, RAM, power on reset, watchdog timer, oscillation detection circuit, 10 bit up/down counter, Millisecond counter, prescaler, voltage level detector (SVLD), compare input, frequency output, LCD driver and several clock functions. The low voltage feature and low power consumption make it the most suitable controller for battery, stand alone and mobile equipment. The EM6620 is manufactured using an Advanced Low Power CMOS Process.

Features

• Low Power - 2.1 µA active mode, LCD On •                - 0.5 µA standby mode, LCD Off •                - 0.1 µA sleep mode •                @ 1.5V, 32kHz, 25°C • True Low Voltage - 1.2 to 3.6 V • SVLD - metal mask programmable (2.0V) • ROM - 1280 x 16 (Mask Programmed) • RAM - 64 x 4 (User Read/Write) • 2 clocks per instruction cycle • RISC architecture (72 basic instructions) • Oscillation supervisor • Timer watchdog (2 sec) • Max. 8 inputs ; port A, port B • Max. 4 outputs ; port B • LCD 8 segments, 3 or 4 times multiplexed • Universal 10-bit counter, PWM, event counter • Prescaler down to 1 Hz (crystal = 32 KHz) • 1/1000 sec, 12 bit binary coded decimal counter with hard or software start/stop function • Frequency output 1Hz, 2048 Hz, 32 KHz, PWM • 7 internal interrupt sources (BCD counter, 2x10-bit counter, 3xprescaler, SVLD) • 5 external interrupt sources (port A, compare) • Equivalent MFP version available (EM6520)

Applications notes

• Frequently Asked Questions for 4-bit EM66xx and EM65xx QA 110 Kb • Memory Requirements for Clock Applications AN #12 101 Kb • Ohmmeter application with EM6X20 AN #18 161 Kb • Frequently Used Software Routines for EM 4-bit Microcontrollers (EM66xx and EM65xx products) AN #30 178 Kb • ADC application with EM6X20 AN #17 111 Kb

Errata

Frequency output on the emulator EM6620 For emulator up to release 24, the register OPTFSelPB (add 7BH) is inverted! Contact us for the new release with the problem corrected. Emulator Bug The instructions NAND, NANDS, NANDX, NANDXS do not work on the emulator. They are working correctly on simulator and chip. Valid for all members of the 4-bit microcontroller family.

Demo Program

Example program for the EM6620 This program implements a simple clock, counting seconds, minutes and hours. 38 Kb Measurement of the temperature 66 Kb Example program for the demo board EM6520 Clock with chronometer 60 Kb Ohmmeter by the measurement of resistors 90 Kb Example program on EM microcontroller peripherals 148 Kb