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EF6805R3

STMicroelectronics
Part Number EF6805R3
Manufacturer STMicroelectronics
Description 8-BIT MICROCOMPUTER UNIT
Published Apr 23, 2005
Detailed Description EF6805U3 8-BIT MICROCOMPUTER UNIT . . . . . . . . . . . . . . . . . . . . . . HARDWARE FEATURES 32 TTL/CMOS COMPATIBLE...
Datasheet PDF File EF6805R3 PDF File

EF6805R3
EF6805R3

Overview
EF6805U3 8-BIT MICROCOMPUTER UNIT .
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HARDWARE FEATURES 32 TTL/CMOS COMPATIBLE I/O LINES 24 BIDIRECTIONAL (8 lines are LED compatible) 8 INPUT-ONLY 3776 BYTES OF USER ROM 112 BYTES OF RAM SELF-CHECK MODE ZERO-CROSSING DETECT/INTERRUPT INTERNAL 8-BIT TIMER WITH 7-BIT SOFTWARE PROGRAMMABLE PRESCALER AND CLOCK SOURCE 5V SINGLE SUPPLY SOFTWARE FEATURES 10 POWERFUL ADDRESSING MODES BYTE EFFICIENT INSTRUCTION SET WITH TRUE BIT MANIPULATION, BIT TEST, AND BRANCH INSTRUCTIONS SINGLE INSTRUCTION MEMORY EXAMINE/CHANGE POWERFUL INDEXED ADDRESSING FOR TABLES FULL SET OF CONDITIONAL BRANCHES MEMORY USABLE AS REGISTER/FLAGS COMPLETE DEVELOPMENT SYSTEM SUPPORT ON INICE USER SELECTABLE OPTIONS 8 BIDIRECTIONAL I/O LINES WITH TTL OR TTL/CMOS INTERFACE OPTION 8 BIDIRECTIONAL I/O LINES WITH TTL OR OPEN-DRAIN INTERFACE OPTION CRYSTAL OR LOW-COST RESISTOR OSCILLATOR OPTION LOW VOLTAGE INHIBIT OPTION VECTORED INTERRUPTS : TIMER, SOFTWARE, AND EXTERNAL USER CALLABLE SELF-CHECK SUBROUTINES DESCRIPTION The EF6805U3 Microcomputer Unit (MCU) is a member of the 6805 Family of low-cost single-chip Microcomputers.
The 8-bit microcomputer contains a CPU, on-chip CLOCK, ROM, RAM, I/O, and TIMER.
It is designed for the user who needs an economical microcomputer with the proven capabilities of the 6800-based instruction set.
A comparison of the key features of several members of the 6805 Family of Microcomputers is shown at the end of this data sheet.
The following are some of the hardware and software highlights of the EF6805U3 MCU.
1 P (PDIP40) FN (PLCC 44) PIN CONNECTIONS March 1989 1/31 EF6805U3 Figure 1 : EF6805U3 HMOS Microcomputer Block Diagram.
ABSOLUTE MAXIMUM RATINGS Symbol V CC V in V in TA Supply Voltage Input Voltage (except TIMER in self-check mode and open-drain inputs) Input Voltage (open-drain pins, TIMER pin in self-check mode) Operating Temperature Range (T L to T H ) Storage Temperature Range Junction Temperature Plastic Package P...


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