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W78LE51P-24 Datasheet

  • W78LE51P-24

  • 8-BIT MTP MICROCONTROLLER

  • 21頁(yè)

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Preliminary W78LE51
8-BIT MTP MICROCONTROLLER
GENERAL DESCRIPTION
The W78LE51 is an 8-bit microcontroller which can accommodate a wide supply voltage range with
low power consumption. The instruction set for the W78LE51 is fully compatible with the standard
8051. The W78LE51 contains an 4K bytes MTP ROM (Multiple-Time Programmable ROM); a 128
bytes RAM; four 8-bit bi-directional and bit-addressable I/O ports; an additional 4-bit I/O port P4; two
16-bit timer/counters; a hardware watchdog timer and a serial port. These peripherals are supported
by seven sources two-level interrupt capability. To facilitate programming and verification, the MTP-
ROM inside the W78LE51 allows the program memory to be programmed and read electronically.
Once the code is confirmed, the user can protect the code for security.
The W78LE51 microcontroller has two power reduction modes, idle mode and power-down mode,
both of which are software selectable. The idle mode turns off the processor clock but allows for
continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
processor.
FEATURES
鈥?/div>
Fully static design 8-bit CMOS microcontroller
鈥?/div>
Wide supply voltage of 2.4V to 5.5V
鈥?/div>
128 bytes of on-chip scratchpad RAM
鈥?/div>
4 KB electrically erasable/programmable MTP-ROM
鈥?/div>
64 KB program memory address space
鈥?/div>
64 KB data memory address space
鈥?/div>
Four 8-bit bi-directional ports
鈥?/div>
One extra 4-bit bit-addressable I/O port, additional
INT2
/ INT3
(available on 44-pin PLCC/QFP package)
鈥?/div>
Two 16-bit timer/counters
鈥?/div>
One full duplex serial port(UART)
鈥?/div>
Watchdog Timer
鈥?/div>
seven sources, two-level interrupt capability
鈥?/div>
EMI reduction mode
鈥?/div>
Built-in power management
鈥?/div>
Code protection mechanism
鈥?/div>
Packages:
鈭?/div>
DIP 40: W78LE51-24
鈭?/div>
PLCC 44: W78LE51P-24
鈭?/div>
PQFP 44: W78LE51F-24
-1-
Publication Release Date: December 1998
Revision A1

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