GENERAL DESCRIPTION
The W78958B is an 8-bit emulation microcontroller that supports emulation for the Winbond W78C51 family of products, including the W78C31, W78C32, W78C51, W78C52, W78C154*, W78C58, W78C438, and W78C458. It is designed to support real-time (up to 40 MHz) emulation tools, such as in-circuit emulators (ICEs).

FEATURES
• 8-bit CMOS emulation microcontroller
• Real-time emulation at up to 40 MHz
• Convenient emulation chip for ICE market
• Two types: standard type and advanced type
• Standard type supports emulation for the W78C31, W78C32, W78C51, W78C52, W78C154*, and W78C58
• Advanced type supports emulation for the W78C438, and W78C458
• In emulation mode, allows direct access to SFRs/PC and internal RAM
• Allows ICE makers to access external program/data memory easily
• Supports switching signals between "internal" and external ROM
• Supports combined emulation program and data memory in a 128 KB SRAM
• Provides internal S1 state clock timing signal for easy creation of the emulation control signals
• Fully static design
• 256-byte on-chip scratchpad RAM
• 64 KB program memory address space in standard type; 1 MB extended program memory address space in advanced type
• 64 KB data memory address space in standard type; 1 MB extended data memory address space in advanced type
• Boolean processor
• Six-source, two-level interrupt capability in standard type; eight-source, two-level interrupt capability in advanced type
• Three 16-bit timer/counters
• One full duplex serial channel
• Built-in power management
• Four 8-bit bidirectional and bit-addressable I/O ports in standard type; four 8-bit bidirectional and bit- addressable I/O ports and one 8-bit bidirectional but parallel I/O port in advanced type
• Packaged in 100-pin PQFP
    - W78958BF-40