參數(shù)資料
型號(hào): ADUC7034BCPZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 52/136頁(yè)
文件大?。?/td> 0K
描述: IC MCU FLASH 32K ANLG IO 48LFCSP
標(biāo)準(zhǔn)包裝: 1
系列: MicroConverter® ADuC7xxx
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 20.48MHz
連通性: LIN,SPI,UART/USART
外圍設(shè)備: POR,PSM,溫度傳感器,WDT
輸入/輸出數(shù): 9
程序存儲(chǔ)器容量: 32KB(16K x 16)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1K x 32
電壓 - 電源 (Vcc/Vdd): 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 2x16b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 115°C
封裝/外殼: 48-VFQFN 裸露焊盤(pán),CSP
包裝: 托盤(pán)
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ADuC7034
Rev. B | Page 22 of 136
The maximum IRQ latency can be similarly calculated, but
must allow for the fact that FIQ has higher priority and may
delay entry into the IRQ handling routine for an arbitrary
length of time. This time can be reduced to 42 cycles if the LDM
command is not used; some compilers have an option to
compile without using this command. Another option is to run
the part in Thumb mode, which reduces the time to 22 cycles.
The minimum latency for a FIQ or IRQ is five cycles. This
consists of the shortest time for the request to pass through the
synchronizer plus the time to enter the exception mode.
Note that the ARM7TDMI initially (first instruction) runs in
ARM (32-bit) mode when an exception occurs. The user can
immediately switch from ARM mode to Thumb mode if required,
for example, when executing interrupt service routines.
MEMORY ORGANIZATION
The ARM7 MCU core, which has a von Neumann-based
architecture, sees memory as a linear array of 232 byte locations.
As shown in Figure 13, the ADuC7034 maps this into four
distinct user areas, namely, a memory area that can be remapped,
an SRAM area, a Flash/EE area, and a memory-mapped register
(MMR) area.
For the ADuC7034, the first 30 kB of this memory space is
used as an area into which the on-chip Flash/EE or SRAM
can be remapped.
The ADuC7034 features a second 4 kB area at the top of
the memory map used to locate the MMRs, through which
all on-chip peripherals are configured and monitored.
The ADuC7034 features an SRAM size of 4 kB.
The ADuC7034 features 32 kB of on-chip Flash/EE
memory, 30 kB of which are available to the user and 2 kB
of which are reserved for the on-chip kernel.
Any access, either a read or a write, to an area not defined in the
memory map results in a data abort exception.
Memory Format
The ADuC7034 memory organization is configured in little
endian format: the least significant byte is located in the lowest
byte address; the most significant byte, in the highest byte address.
BIT 31
BYTE 2
A
6
2
.
BYTE 3
B
7
3
.
BYTE 1
9
5
1
.
BYTE 0
8
4
0
.
BIT 0
32 BITS
0xFFFFFFFF
0x00000004
0x00000000
07
11
6-
00
9
Figure 12. Little Endian Format
0x00040FFF
0x00040000
0xFFFF0FFF
0xFFFF0000
MMRs
0x00087FFF
0x00080000
FLASH/EE
SRAM
0x00007FFF
0x00000000
REMAPPABLE MEMORY SPACE
(FLASH/EE OR SRAM)
RESERVED
07
11
6-
0
10
Figure 13. ADuC7034 Memory Map
SRAM
The ADuC7034 features 4 kB of SRAM, organized as 1024 ×
32 bits, that is, 1024 words located at 0x00040000.
The RAM space can be used as data memory and also as a
volatile program space.
ARM code can run directly from SRAM at full clock speed
because the SRAM array is configured as a 32-bit-wide memory
array. SRAM is readable/writeable in 8-/16-/32-bit segments.
Remap
The ARM exception vectors are situated at the bottom of the
memory array, from Address 0x00000000 to Address 0x00000020.
By default, after a reset, the Flash/EE memory is mapped to
Address 0x00000000.
It is possible to remap the SRAM to Address 0x00000000. This is
accomplished by setting Bit 0 of the SYSMAP0 MMR. To revert
Flash/EE to Address 0x00000000, Bit 0 of SYSMAP0 is cleared.
It is sometimes desirable to remap RAM to Address 0x00000000
to optimize the interrupt latency of the ADuC7034 because
code can run in full 32-bit ARM mode and at maximum core
speed. It should be noted that when an exception occurs, the
core defaults to ARM mode.
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