EM78805A数据手册Elan中文资料规格书

描述 Description

The EM78805A is an 8-bit CID (Call Identification) RISC type microprocessor with low power , high speed CMOS technology . Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time clock /counter , internal interrupt , power down mode , LCD driver , Tone generator and tri-state I/O . The EM78805A/B provides a single chip solution to design a CID of calling message display.

特性 Features

CPUOperating voltage range : 2.2V°3.6V 
8K x 13 on chip One Time Programmable ROM
1.1K x 8 on chip RAM 
Up to 28 bi-directional tri-state I/O ports 
8 level stack for subroutine nesting 
8-bit real time clock/counter (TCC) with 8-bit prescaler 
Two sets of 8 bit counters can be interrupt sources 
Selective signal sources and overflow interrupt 
Programmable free running on chip watchdog timer 
99.9% single instruction cycle commands 
four modes (Main clock 3.579 , 1.79, 0.895 or 0.447MHz generated by internal PLL) 
* Sleep mode : CPU and Main clock turn off, 32.768KHz clock turn off 
* Idle mode : CPU and Main clock turn off, 32.768KHz clock turn on 
* Green mode : Main clock turn off, CPU and 32.768KHz clock turn on 
* Normal mode : Main clock turn on , CPU and 32.768KHz clock turn on
Input port wake up function 
7 interrupt source , 4 external , 3 internal 
IO Port key scan function 
IO Port interrupt , pull high ,wake-up and open drain functions 
External Sub-Clock frequency is 32.768KHz 
Dual TONE Generators 
LCDLCD operation voltage chosen by software
Common driver pins : 16 (8 of 16 Common shared by I/O) 
Segment driver pins : 32 (12 of 32 Segment shared by I/O) 
1/4 bias 
1/8,1/16 duty 
PACKAGE100-pin QFP (EM78805AAQ, POVD disable) (EM78805ABQ, POVD enable) or 64 pin Chip (EM78805AH)