National CP3BT26 - Manual (Page 24)

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CP3BT26
6.0 Memory
The CP3BT26 supports a uniform 16M-byte linear address
space. Table 6 lists the types of memory and peripherals
that occupy this memory space. Unlisted address ranges are reserved and must not be read or written. The BIU
zones are regions of the address space that share the same
control bits in the Bus Interface Unit (BIU).
Table 6 CP3BT26 Memory Map
6.1 OPERATING ENVIRONMENT
The operating environment controls whether external mem-
ory is supported and whether the reset vector jumps to a
code space intended to support In-System Programming
(ISP). Up to 12M of external memory space is available.
The operating mode of the device is controlled by the states
on the ENV[2:0] pins at reset and the states of the EMPTY
bits in the Protection Word, as shown in Table 7. Internal
pullups on the ENV[2:0] pins select IRE mode or ISP mode
if these pins are allowed to float.
When ENV[2:0] = 111b, IRE mode is selected unless the
EMPTY bits in the Protection word indicate that the program
flash memory is empty (unprogrammed), in which case ISP
mode is selected. When ENV[2:0] = 011b, ERE mode is se-
lected unless the EMPTY bits indicate that the program
flash memory is empty, in which case ISP mode is selected.
When ENV[2:0] = 110b, ISP mode is selected without re-
gard to the states of the EMPTY bits. See Section 8.4.2 for
more details.
In the DEV environment, the on-chip flash memory is dis-
abled, and the corresponding region of the address space
is mapped to external memory. DEVINT mode is equivalent
to DEV mode but maps static memory zone 0 to the on-chip
memory.
Start
Address
End
Address
Size in
Bytes
Description BIU Zone
00 0000h 03 FFFFh 256K
On-chip Flash Program Memory, including Boot
Memory Static Zone 0
(mapped internally
in IRE and ERE
mode; mapped to
the external bus in
DEV mode)
04 0000h 0C FFFFh 576K Reserved
0D 0000h 0D 1FFFh 8K On-chip Flash Data Memory
0D 2000h 0D FFFFh 56K Reserved
0E 0000h 0E 7FFFh 32K System RAM N/A
0E 8000h 0E 91FFh 4.5K Bluetooth Data RAM
0E 9200h 0E E7FFh 21.5K Reserved
0E E800h 0E EBFFh 1K Bluetooth Lower Link Controller Sequencer RAM
0E EC00h 0E EFFFh 1K Reserved
0E F000h 0E F13Fh 320 CAN Buffers and Registers
0E F140h 0E F17Fh 64 Reserved
0E F180h 0E F1FFh 128 Bluetooth Lower Link Controller Registers
0E F200h 0F FFFFh 67K Reserved
10 0000h 3F FFFFh 3072K Reserved
40 0000h 7F FFFFh 4096K External Memory Zone 1 Static Zone 1
80 0000h FE FFFFh 8128K External Memory Zone 2 Static Zone 2
FF 0000h FF F1FFh 61952 Reserved
FF F200h FF F5FFh 1K Peripherals and Other I/O Ports N/A
FF F600h FF FAFFh 1280 BIU, DMA, Flash interfaces IN/A
FF FB00h FF FBFFh 256 I/O Expansion I/O Zone
FF FC00h FF FFFFh 1K Peripherals and Other I/O Ports N/A