W78LE52/W78L052A

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1.

GENERAL DESCRIPTION

The W78L052 is an 8-bit microcontroller which can accommodate a wider frequency range with low

power consumption. The instruction set for the W78L052 is fully compatible with the standard 8051.

The W78L052 contains an 8K bytes Flash EPROM; a 256 bytes RAM; four 8-bit bi-directional and bit-

addressable I/O ports; an additional 4-bit I/O port P4; three 16-bit timer/counters; a hardware

watchdog timer and a serial port. These peripherals are supported by eight sources two-level interrupt

capability. To facilitate programming and verification, the Flash EPROM inside the W78L052 allows

the program memory to be programmed and read electronically. Once the code is confirmed, the user

can protect the code for security.

The W78L052 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

Fully static design 8-bit CMOS microcontroller

Wide supply voltage of 2.4V to 5.5V

256 bytes of on-chip scratchpad RAM

8 KB electrically erasable/programmable Flash EPROM

64 KB program memory address space

64 KB data memory address space

Four 8-bit bi-directional ports

(available on 44-pin PLCC/QFP package)

Three 16-bit timer/counters

One full duplex serial port(UART)

Watchdog Timer

Eight sources, two-level interrupt capability

EMI reduction mode

Built-in power management

Code protection mechanism

Packages:

− Lead Free (RoHS) DIP 40:

W78L052A24DL

− Lead Free (RoHS) PLCC 44: W78L052A24PL

− Lead Free (RoHS) PQFP 44: W78L052A24FL