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AT89LS51 Datasheet(PDF) 6 Page - ATMEL Corporation

No. de pieza AT89LS51
Descripción Electrónicos  8-bit Low-Voltage Microcontroller with 4K Bytes In-System Programmable Flash
Download  32 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LS51 Datasheet(HTML) 6 Page - ATMEL Corporation

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6
3053B–MICRO–3/05
AT89LS51
4.10
EA/VPP
External Access Enable. EA must be strapped to GND in order to enable the device to fetch
code from external program memory locations starting at 0000H up to FFFFH. Note, however,
that if lock bit 1 is programmed, EA will be internally latched on reset.
EA should be strapped to V
CC for internal program executions.
This pin also receives the 12-volt programming enable voltage (V
PP) during Flash programming.
4.11
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
4.12
XTAL2
Output from the inverting oscillator amplifier
5.
Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
Table 5-1.
Note that not all of the addresses are occupied, and unoccupied addresses may not be imple-
mented on the chip. Read accesses to these addresses will in general return random data, and
write accesses will have an indeterminate effect.


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