Product folder

EM6821 (obsolete, replaced by EM6625) Ultra-low power Microcontroller with 4x20 LCD driver

Contents:   •  Datasheet   •  General description   •  Features   •  Errata

Datasheet DataSheet 1064 Kb

General description

The EM6821 is an advanced single chip low cost CMOS microcontroller. It contains ROM, RAM, LCD driver, power on reset, watchdog timer, oscillation detection circuit, 10-bit up/down and event counter, 1ms BCD counter, prescaler, voltage level detector (Vld), serial interface 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 EM6821 is manufactured using an Advanced Low Power CMOS process.

Features

• Low Power - 1.3 µA active mode, LCD On •                - 0.4 µA standby mode, LCD Off •                - 0.1 µA sleep mode •                @ 3V, 32 KHz, 25 ºC • True Low Voltage - 1.2 to 3.6 V • 2 clocks per instruction cycle • 2 basic instructions • ROM 4k x 16 bits • RAM 128 x 4 bits • Max. 12 inputs ; port A, port B, port SP • Max. 8 outputs ; port B, port SP • Voltage Level Detector, 8 levels software selectable from 1.2 V up to 4.0 V • Melody, 7 tones + silence inclusive 4-bit timer • Universal 10-bit counter, PWM, event counter • Prescaler down to 1 second ( crystal = 32 KHz ) • 1/1000 sec 12 bit binary coded decimal counter with hard or software start/stop function • LCD 20 Segments, 3 or 4 times multiplexed • 3 wire serial port , 8 bit, master and slave mode • 5 external interrupts (port A, serial interface) • 8 internal interrupts (3x prescaler, BCD counter, 2x10-bit counter, melody timer, serial interface) • Timer watchdog and oscillation supervisor • Equivalent MFP version available (EM6521)

Errata

Buzzer on the emulator EM6621/22/25/26 and EM6821 The Emulator Buzzer output connector pin (nbr 21) does only pull high and its tristate function is not correctly implemented. Correction: New emulators dated march/2000 and up are ok. The old emulators need to be send back to EM for correction, or EM should send a corrected FPGA setup EEPROM. 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.