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-40Pinout
Specifications
| PARAMETER |
SYMBOL |
MIN |
MAX |
UNIT |
| DC Power Supply |
VDD-V |
-0.3 |
+7.0 |
|
| Input Voltage |
V |
VSS |
VDD |
V |
| Operating Temperature |
OPR |
0 |
|
°C |
|
TstG |
|
+150 |
°C |
DescriptionThe 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
W78958B Data Sheet
