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USER’S GUIDE
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PRODUCT DESCRIPTION
All devices listed below have the standard 8051 family
feature set listed once here for convenience, but not re-
peated for each device.
• 8051–compatible instruction set
• Addresses 64K program and 64K data memory
• Four 8–bit pseudo–bidirectional I/O ports
• 128 bytes scratchpad RAM
• Two 16–bit timer/counters
• One UART
• Five Interrupts with two external
DS5000FP Soft Microprocessor Chip
The DS5000FP is the original Soft Microprocessor chip.
It adds the following features to the 8051 set :
• Non–multiplexed Byte–wide address/data bus for
memory access.
• Nonvolatile Control for 8K x 8 or 32K x 8 SRAMs
• Partitions one SRAM into program and data areas,
and write protects the program segment
• Decodes memory for up to two 32K x 8 SRAMs (#2
is data memory only)
• Power–fail Reset, and Interrupt
• Precision Watchdog Timer
• ROM based Serial Bootstrap Loader
• Optional security features
– Memory encryption in real–time
– 48–bit user selected encryption key
– Security lock destroys memory if unlocked
– Vector RAM hides 48 bytes on–chip
– Dummy operations on the memory bus
DS5000(T) Soft Microcontroller Module
The DS5000 incorporates the DS5000FP chip in a
40–pin module with an 8051 footprint and pinout.
• Familiar 40–pin DIP package
• Built–in NV RAM of 8K x 8 or 32K x 8
• I/O ports not disturbed by on–board memory access
• 10–year data retention and clock operation in the
absence of power
• Partitions memory into program and data areas,
write protects the program segment
• Power–fail Reset and Interrupt
• Precision Watchdog Timer
• ROM based Serial Bootstrap Loader
• Optional memory security
• Optional built–in real time clock (battery backed)
DS2250(T) Soft Microcontroller Module
The DS2250(T) incorporates the DS5000FP chip on a
40–pin SIMM module. It has the identical feature set as
the DS5000(T), but is in a different form–factor. This
package change allows up to 64K bytes NV RAM
instead of 32K bytes. Note that as mentioned above, the
second 32K is restricted to data memory. Like the
DS5000(T), this module guarantees better than
10–year data retention at room temperature.
DS5001FP 128K Soft Microprocessor Chip
The DS5001FP provides the base feature set of the
DS5000FP with the following extras:
• Accesses up to 128K bytes on the Byte–wide bus.
• Decodes memory for 32K x 8 or 128K x 8 SRAMs.
• Four additional decoded peripheral chip enables
• CRC hardware for checking memory validity
• Optionally emulates an 8042 style slave interface
• Bandgap reference for more accurate power moni-
tor
Note: The DS5001FP has no memory encryption
feature.