20-101-1257 Rabbit Semiconductor, 20-101-1257 Datasheet - Page 34
![COMPUTER SINGLE-BOARD BL4S150](/photos/6/75/67538/20-101-1257_sml.jpg)
20-101-1257
Manufacturer Part Number
20-101-1257
Description
COMPUTER SINGLE-BOARD BL4S150
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-101-1258.pdf
(144 pages)
Specifications of 20-101-1257
Module/board Type
Single Board Computer Module
Product
Modules
Processor Type
Rabbit 4000
Sram
1 MB
Flash
2 MB
Timers
8 bit, 10 bit
Number Of I/os
20
Backup Battery
3 V Lithium Coin Type
Operating Voltage
9 V to 36 V
Board Size
96 mm x 146 mm x 16 mm
Description/function
Computer Module
For Use With/related Products
BL4S150
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
316-1170
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3.7 Memory
3.7.1 SRAM
All BL4S100 boards have 512KB of battery-backed data SRAM, and 512KB–1MB of fast
program execution SRAM.
3.7.2 Flash Memory
BL4S100 boards have 1MB—2MB of serial flash memory.
Writing to arbitrary flash memory addresses at run time is also discouraged. Instead,
define a “user block” area to store persistent data. The functions
writeUserBlock()
and
are provided for this.
readUserBlock()
3.7.3 VBAT RAM Memory
The tamper detection feature of the Rabbit microprocessor can be used to detect any
attempt to enter the bootstrap mode. When such an attempt is detected, the VBAT RAM
memory in the Rabbit microprocessor is erased. The serial bootloader on the BL4S100
boards uses the bootstrap mode to load the SRAM, which erases the VBAT RAM memory
on any reset, and so it cannot be used for tamper detection.
BL4S100 User’s Manual
32
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