w78e051c Winbond Electronics Corp America, w78e051c Datasheet - Page 2

• Manufacturer Part Number: w78e051c
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
The W78E051C is an 8-bit microcontroller which can accommodate a wider frequency range with low
power consumption. The instruction set for the W78E051C is fully compatible with the standard 8051.
The W78E051C contains an 4K bytes Flash EPROM; 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 Flash EPROM inside the
W78E051C allows the program memory to be programmed and read electronically. Once the code is
confirmed, the user can protect the code for security.
The W78E051C 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.
2. FEATURES
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Fully static design 8-bit CMOS microcontroller
Wide supply voltage of 4.5V to 5.5V
128 bytes of on-chip scratchpad RAM
4 KB On-chip Flash EPROM
64 KB program memory address space
64 KB data memory address space
Four 8-bit bi-directional ports
One extra 4-bit bit-addressable I/O port, additional INT2 / INT3
(available on 44-pin PLCC/QFP package)
Two 16-bit timer/counters
One full duplex serial port(UART)
Watchdog Timer
Seven sources, two-level interrupt capability
EMI reduction mode
Built-in power management
Code protection mechanism
Packages:
− Lead Free (RoHS) DIP 40:
− Lead Free (RoHS) PLCC 44: W78E051C40PL
− Lead Free (RoHS) PQFP 44: W78E051C40FL
W78E051C40DL
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W78E51C/W78E051C