EM78P142

The EM78P142 is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology.The series have an on-chip 2K*13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of user's OTP memory code. Three Code option bits are also available to meet user's requirements.

Features of the EM78P142 are:(1)easily implemented IR (infrared remote control); (2)8-bit real time clock (TCC) with overflow interrupt; (3)8-bit real time clock (TCCA, TCCC) and 16-bit real time clock (TCCB) with overflow interrupt; (4)7-bit multi-channel analog-to-digital converter with 12-bit resolution in Vref mode; (5)80*8 bits on-chip registers (SRAM); (6)8-level stacks for subroutine nesting; (7)4 programmable level voltage detector.With enhanced OTP-ROM features, the EM78P142 provide a convenient way of developing and verifying user's programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using development and programming tools. User can avail of the ELAN Writer to easily program his development code.

The absolute maximum ratings of the EM78P142 can be summarized as:(1)storage temperature range:-65 to 150;(2)output voltage:Vss-0.3 to Vdd+0.5V;(3)input supply:Vss-0.3 to Vdd+0.5V;(4)working voltage:2.3 to 5.5V;(5)working frequency:16MHz;(6)temperature under bias:-40 to 85.The accuracy, linearity, and speed of the successive approximation of the AD converter are dependent on the properties of the ADC and the comparator. The source impedance and the internal sampling impedance directly affect the time required to charge the sample holding capacitor. The application program controls the length of the sample time to meet the specified accuracy.The watchdog timer is a free running on-chip RC oscillator.The WDT will keep on running even when the oscillator driver has been turned off (i.e., in sleep mode).During normal operation or in sleep mode, a WDT time-out (if enabled) will cause the device to reset. The WDT can be enabled or disabled any time during normal mode through software programming.