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