GENERAL DESCRIPTION
The W78LE58 is an 8-bit microcontroller which has an in-system programmable MTP-ROM for firmware updating. The instruction set of the W78LE58 is fully compatible with the standard 8052. The W78LE58 contains a 32K bytes of main MTP-ROM and a 4K bytes of auxiliary MTP-ROM which allows the contents of the 32KB main MTP-ROM to be updated by the loader program located at the 4KB auxiliary MTP-ROM; 512 bytes of on-chip RAM; four 8-bit bi-directional and bit-addressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; a serial port. These peripherals are supported by a eight sources two-level interrupt capability. To facilitate programming and verification, the MTP-ROM inside the W78LE58 allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security.

FEATURES
• Fully static design 8-bit CMOS microcontroller
• 32K bytes of in-system programmable MTP-ROM for Application Program (APROM)
• 4K bytes of auxiliary MTP-ROM for Loader Program (LDROM)
• 512 bytes of on-chip RAM. (including 256 bytes of AUX-RAM, software selectable)
• 64K bytes program memory address space and 64K bytes data memory address space
• Four 8-bit bi-directional ports
• One 4-bit multipurpose programmable port
• Three 16-bit timer/counters
• One full duplex serial port
• Eight-sources, two-level interrupt capability
• Built-in power management
• Code protection
• Packaged in
    - DIP 40: W78LE58-24
    - PLCC 44: W78LE58P-24
    - QFP 44: W78LE58F-24