VRS1000 데이터 시트보기 (PDF) - Unspecified
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VRS1000 Datasheet PDF : 47 Pages
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VRS1000
VERSA
Datasheet Rev 1.6
VRS1000 Program Memory
The VRS1000 includes 64K of on-chip Flash memory
that can be used as program memory but it can also
be used as non-volatile data storage memory using the
In-Application programming feature (IAP).
ISP Program Memory Zone
The upper portion of the VRS1000 Flash memory can
be reserved to hold an ISP boot program.
This boot program can be used to perform the Flash
memory programming using the serial interface or any
other method by making use of the In-Application
Programming (IAP) feature of the VRS1000 which
permits the processor to load the program from an
external device or system and program it into the Flash
memory (See the VRS1000 IAP feature section)
The size of the memory block reserved for the ISP
boot program (when activated) is adjustable from 512
Bytes up to 4k Bytes in increment of 512 Bytes.
FIGURE3: VRS1000-ISP PROGRAM SIZE VS ISP CONFIG. VALUE
ISP Program Size =
ISP Config value x 512Bytes
F FFFh
FE00h
FC00h
FA00h
F800h
F600h
F400h
F200h
F000h
0000h
Programming the ISP Boot Program
The ISP boot program must be programmed into the
device using a parallel programmer such as the low
cost VERSAMCU-PPR or a commercial parallel
programmer supporting the VRS1000. The Flash
memory reserved for the ISP program is defined in the
parallel programmer software at the moment the
device is programmed.
FIGURE 4: VERSAMCU-PPR PROGRAM INTERFACE WINDOW
When programming the ISP boot program into the
VRS1000, it is recommended to activate the “lock bit”
option to protect the ISP flash memory zone from
being inadvertently erased when the Flash Erase
operations are performed (See the VRS1000 IAP
feature section for details on IAP functions)
ISP Program Start Conditions
Setting the ISP page configuration to a value other
than 0 will make the Processor jump to the base
address of the ISP boot code when a hardware reset is
performed, provided that the value FFh is present at
program address 0000h.
It is also possible to call the ISP program by doing a
program jump instruction to its start address
When the ISP page configuration is set to 0 at the
moment the device is programmed using a parallel
programmer, the ISP boot feature will be disabled.
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