W78C52705 - 8-BIT EMULATION MICROCONTROLLER 

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).

The W78958B is packaged in a 100-pin PQFP and is available in two different types, standard and

advanced. The standard type supports the functions of the W78C31, W78C32, W78C51, W78C52,

W78C154*, and W78C58. The advanced type supports the functions of the W78C438 and W78C458.

Both types can be operated in two modes, normal and emulation. In normal mode, the W78958B runs

freely, like the W78C51 family of products. In emulation mode, which is entered by driving the

ICESET pin high asynchronously, the W78958B stays in the S2 state of the next instruction. In this

mode, the W78958B allows direct access (read/write) to the special function registers (SFRs), the

program counter (PC), and the internal RAM. Also, it allows ICE makers to access the external

program and data memory easily, thereby eliminating the need for glue logic. Moreover, it provides

several signals to facilitate ICE design, including IPME (Internal Program Memory Enable), for

switching between "internal" and external ROM, ESEL (Emulation address space Select), for

combining the emulation program and data memory in a 128 KB SRAM, and CLKS1 (internal S1

state clock timing signal), for creating the emulation control signals. Once the ICESET pin goes low,

the W78958B will release its internal clock and return to its normal operating mode.

For detailed specifications concerning the W78C31, W78C32, W78C51, W78C52, W78C154*,

W78C58, W78C438, and W78C458, refer to the Functional Description below or to the Winbond

product specifications.

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