cp3cn17 National Semiconductor Corporation, cp3cn17 Datasheet - Page 25
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cp3cn17
Manufacturer Part Number
cp3cn17
Description
Reprogrammable Connectivity Processor With Can Interface
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3CN17.pdf
(220 pages)
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6.0
The CP3CN17 supports a uniform 16M-byte linear address
space. Table 8 lists the types of memory and peripherals
that occupy this memory space. Unlisted address ranges
6.1
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 9. 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-
0E EC00h
0E C000h
0E E800h
FF FB00h
FF FC00h
0E 0000h
0E 2000h
0E 8000h
0E 9200h
0E F000h
0E F140h
0E F180h
0E F200h
FF 0000h
00 0000h
04 0000h
10 0000h
40 0000h
80 0000h
Address
Start
Memory
OPERATING ENVIRONMENT
0D FFFFh
0E BFFFh
0E EBFFh
0E EFFFh
FE FFFFh
FF FBFFh
0E 1FFFh
0E 7FFFh
0E E7FFh
0E F1FFh
0F FFFFh
3F FFFFh
7F FFFFh
FF FAFFh
FF FFFFh
03 FFFFh
0E 91FFh
0E F13Fh
0E F17Fh
Address
End
Size in
3072K
4096K
8128K
Bytes
64256
11.5K
67.5K
256K
640K
4.5K
24K
10K
320
128
256
8K
1K
1K
64
1K
Table 8 CP3CN17 Memory Map
On-chip Flash Program Memory, including Boot
Memory
Reserved
On-chip Flash Data Memory
Reserved
Reserved
Reserved
System RAM
Reserved
Reserved
CAN Buffers and Registers
Reserved
Reserved
Reserved
Reserved
External Memory Zone 1
External Memory Zone 2
BIU Peripherals
I/O Expansion
Peripherals and Other I/O Ports
25
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).
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.
ENV[2:0] EMPTY
111
011
000
110
111
011
Description
Table 9 Operating Environment Selection
N/A
N/A
Yes
Yes
No
No
Internal ROM enabled (IRE) mode
External ROM enabled (ERE) mode
Development (DEV) mode
In-System-Programming (ISP) mode
In-System-Programming (ISP) mode
In-System-Programming (ISP) mode
Operating Environment
Static Zone 0
(mapped internally
in IRE and ERE
mode; mapped to
the external bus in
DEV mode)
N/A
Static Zone 1
Static Zone 2
I/O Zone
N/A
www.national.com
BIU Zone
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