Zilog Z8F0130 - Manual (Page 128)

Using the Integrated Development Environment UM013037-1212
104
Zilog Developer Studio II – Z8 Encore!
User Manual
your code or data has grown beyond your system’s capability. The system also uses mem-
ory ranges to automatically locate your code or data.
The Address Spaces fields define the memory layout of your target system. The Address
Spaces page of the Project Settings dialog box allows you to configure the ranges of
memory available on your target Z8 Encore! microcontroller. These ranges vary from pro-
cessor to processor, as well as from target system to target system.
ZDS II divides Z8 Encore! memory into several spaces, some of which are available only
on selected processor types:
•
ROM
The ROM space is used for code storage and can also be used for the storage of con-
stant data. ROM memory is located at program addresses
0000H–xxxxH , at which
xxxxH is the highest location in program memory.
•
RData (register data)
The RData memory is located in 00H – FFH and is used for a small memory model.The
low boundary is set to 10H by default. The low boundary must be set by 10H higher
for one level of interrupts. For example, for a nonnesting interrupt, set the low bound-
ary to
20H ; for two levels of interrupts, set the low boundary to 30H ; and so on. For
more information about interrupts, see the SET_VECTOR section on page 237.
•
EData (extended data)
EData is used for default data storage in the large memory model. The EData memory
begins at data address
100H and extends to a maximum of EFFH . Some CPUs provide
less data memory, so the upper bound of this range will be less than EFFH . This
reduced upper bound is displayed by default in the GUI when one of those parts is
selected as the CPU in your project. See the product specification for your particular
CPU to find out how much on-chip RAM is provided.
If your CPU is one of the Z8 Encore! XP F1680 Series devices that has PRAM and you
choose not to use the PRAM memory (by deselecting the
Use PRAM checkbox), then the
512 or 1024 bytes that could have been used for PRAM will instead be available as addi-
tional EData memory and will be mapped onto the end of EData. If you want to use this
additional data storage, you must modify the upper bound of your EData range to add the
extra memory.


For example, if your upper EData bound previously was
3FF and you choose not to use the
available 512 bytes ( 200H ) of PRAM, you can increase the upper bound of your EData
range to 5FF .
•
NVDS
Note: