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EF6805P2FNLD Datasheet

  • EF6805P2FNLD

  • 8-BIT, OTPROM, 1MHz, MICROCONTROLLER, PQCC28, PLASTIC, LCC-2...

  • 375.98KB

  • 31页

  • STMICROELECTRONICS   STMICROELECTRONICS

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EF6805U3
8-BIT MICROCOMPUTER UNIT
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HARDWARE FEATURES
32 TTL/CMOS COMPATIBLE I/O LINES
24 BIDIRECTIONAL (8 lines are LED compati-
ble)
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 SOFT-
WARE 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 EXA-
MINE/CHANGE
POWERFUL INDEXED ADDRESSING FOR
TABLES
FULL SET OF CONDITIONAL BRANCHES
MEMORY USABLE AS REGISTER/FLAGS
COMPLETE DEVELOPMENT SYSTEM SUP-
PORT 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 O-
PEN-DRAIN INTERFACE OPTION
CRYSTAL OR LOW-COST RESISTOR OSCIL-
LATOR OPTION
LOW VOLTAGE INHIBIT OPTION
VECTORED INTERRUPTS : TIMER, SOFT-
WARE, AND EXTERNAL
USER CALLABLE SELF-CHECK SUBROU-
TINES
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 TI-
MER. It is designed for the user who needs an eco-
nomical microcomputer with the proven capabilities
of the 6800-based instruction set. A comparison of
the key features of several members of the 6805 Fa-
mily 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

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