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| 型號： | ADUC7020 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU |
| 中文描述： | 精密模擬微控制器的12位模擬I / O，ARM7TDMI的微控制器 |
| 文件頁數(shù)： | 21/80頁 |
| 文件大?。?/td> | 840K |
| 代理商： | ADUC7020 |
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Preliminary Technical Data
ADuC702x Series
MEMORY ORGANISATION
Rev. PrB | Page 21 of 80
The part incorporates two separate blocks of memory, 8kByte of
SRAM and 64kByte of On-Chip Flash/EE memory. 62kByte of
On-Chip Flash/EE memory are available to the user, and the
remaining 2kBytes are reserved for the factory configured boot
page. These two blocks are mapped as shown in
Figure 4
.
Note that by default, after a reset, the Flash/EE memory is
mirrored at address 0x00000000. It is possible to remap the
SRAM at address 0x00000000 by clearing bit 0 of the REMAP
MMR. This remap function is described in more details in the
Flash/EE memory chapter.
Re-mappable Memory Space
(Flash/EE or SRAM)
Reserved
00080000h
Flash/EE
Reserved
00011FFFh
00010000h
SRAM
FFFF0000h
FFFFFFFFh
MMRs
0000FFFFh
00000000h
0008FFFFh
Figure 4: Physical memory map
Memory Access
The ARM7 core sees memory as a linear array of 232 byte
location where the different blocks of memory are mapped as
outlined in
Figure 4
.
The ADuC702x memory organisation is configured in little
endian format: the least significant byte is located in the lowest
byte address and the most significant byte in the highest byte
address.
Figure 5: little endian format
Flash/EE Memory
The total 64kBytes of Flash/EE are organised as 32k X 16 bits.
31k X 16 bits are user space and 1k X 16 bits is reserved for the
on chip kernel. The page size of this Flash/EE memory is
512Bytes.
62kBytes of Flash/EE are available to the user as code and non-
volatile data memory. There is no distinction between data and
program as ARM code shares the same space. The real width of
the Flash/EE memory is 16 bits, which means that in ARM
mode (32-bit instruction), two accesses to the Flash/EE are
necessary for each instruction fetch. It is therefore
recommended to use Thumb mode when executing from
Flash/EE memory for optimum access speed. The maximum
access speed for the Flash/EE memory is 45MHz in Thumb
mode and 22.5MHz in full ARM mode. More details on
Flash/EE access time are outlined later in ‘Execution from
SRAM and Flash/EE’ section of this datasheet.
SRAM
8kBytes of SRAM are available to the user, organized as 2k X 32
bits, i.e. 2kWords. ARM code can run directly from SRAM at
45MHz , given that the SRAM array is configured as a 32-bit
wide memory array. More details on SRAM access time are
outlined later in ‘Execution from SRAM and Flash/EE’ section
of this datasheet.
Memory Mapped Registers
The Memory Mapped Register (MMR) space is mapped into
the upper 2 pages of the memory array and accessed by indirect
addressing through the ARM7 banked registers.
The MMR space provides an interface between the CPU and all
on-chip peripherals. All registers except the core registers
reside in the MMR area. All shaded locations shown in Figure 6
are unoccupied or reserved locations and should not be
accessed by user software. Table 6 shows a full MMR memory
map.
32 bits
Byte0
Byte1
Byte2
Byte3
0x00000000h
0x00000004h
bit0
bit31
0
1
2
3
4
5
6
7
8
9
A
B
.
.
.
.
0xFFFFFFFFh
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