Product folder

EM6635 (obsolete) Low power MCU with 32kHz crystal and 500kHz RC oscillators and 9 high drive outputs capable of driving up to 20mA

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

Datasheet DataSheet 799 Kb

General description

The EM6635 is a low voltage, low power microcontroller containing 9 integrated high-drive outputs able to provide up to 20mA. It is ideal for use in applications in which one must drive devices such as motor drivers, small stepping motors, LEDs, triacs, external EEPROM or other ICs in the system. EM6635 has both a 32kHz crystal oscillator and a 500kHz RC oscillator without external component, as well as an external clock to be driven up to 4Mhz. The CPU operating clock can be switched from crystal to RC oscillator for high-speed operation. It has a frequency/melody generator with 255 programmable frequencies for quality buzzer. The EM6635 contains the equivalent of 8kB mask ROM and the RAM has a capacity of 256x4 bits. It also has a power-on reset, watchdog timer, 2 timers 8bits, 2 BCD counters, 3bits event counter, 4 wire serial port 8bits and several clock functions. Tool available is a windows-based emulator.

Features

• 32768 Hz crystal oscillator • 500 kHz RC Oscillator (no external component) • External clock (metal option) • 9 High drive outputs: up to 20mA • Melody generator with 255 programmable frequencies • True Low Power:   1.5uA active mode, 0.4uA halt mode • Low Supply Voltage 1.2V to 3.6V •  • and more... • Max. 14 Inputs with selectable debouncers; Port P1, P2, P6, P70, P71 • Max. 15 outputs (9 I/O High drive outputs); Port P3, P4, P6, P70, P71, P72 • Mask ROM 4096 x 16bits • RAM 256 x 4bits • 2 clocks per instruction cycle • 72 basic instructions • 2 outputs; Reset OUT, Buzzer OUT • 2 timers 8bits • 2 x 4 bits BCD counters • Event counter 3bits • Prescaler down to 1Hz (crystal =32kHz), readable by CPU in 2 ranges • Serial Port as selectable configuration of Port 5 • 18 Interrupts: 12 internal, 6 external • Voltage Level Detector, 3 levels software selectable • Die form and MLF2, 40 pin (Micro Lead Frame) package

Applications

Watch & clock Timer / sports timing devices Security / Industrial Toys Sensor interface

Applications notes

• How to drive a static LCD from a standard I/O port AN #25 40 Kb

Errata

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.