National CP3BT26 User Manual
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24
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
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).
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.
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.
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
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.
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.
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
Memory
Static Zone 0
(mapped internally
in IRE and ERE
mode; mapped to
the external bus in
DEV mode)
(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