參數(shù)資料
型號： AT91SAM7S256C-MU
廠商： Atmel
文件頁數(shù)： 10/165頁
文件大?。?/td> 0K
描述： IC ARM7 MCU 32BIT 256K 64QFN
標(biāo)準(zhǔn)包裝： 260
系列： SAM7S
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 55MHz
連通性： I²C，SPI，SSC，UART/USART，USB
外圍設(shè)備： 欠壓檢測/復(fù)位，DMA，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 256KB（256K x 8）
程序存儲器類型： 閃存
RAM 容量： 64K x 8
電壓 - 電源 (Vcc/Vdd)： 1.65 V ~ 1.95 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-VFQFN 裸露焊盤
包裝： 托盤
107
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
19.2.2
Read Operations
An optimized controller manages embedded Flash reads. A system of 2 x 32-bit buffers is added in order to start
access at following address during the second read, thus increasing performance when the processor is running in
Thumb mode (16-bit instruction set). See Figure 19-2, Figure 19-3 and Figure 19-4.
This optimization concerns only Code Fetch and not Data.
The read operations can be performed with or without wait state. Up to 3 wait states can be programmed in the
field FWS (Flash Wait State) in the Flash Mode Register MC_FMR (see “MC Flash Mode Register” on page 115).
Defining FWS to be 0 enables the single-cycle access of the embedded Flash.
The Flash memory is accessible through 8-, 16- and 32-bit reads.
As the Flash block size is smaller than the address space reserved for the internal memory area, the embedded
Flash wraps around the address space and appears to be repeated within it.
Figure 19-2. Code Read Optimization in Thumb Mode for FWS = 0
Note:
When FWS is equal to 0, all accesses are performed in a single-cycle access.
Figure 19-3. Code Read Optimization in Thumb Mode for FWS = 1
Note:
When FWS is equal to 1, in case of sequential reads, all the accesses are performed in a single-cycle access (except for the
first one).
Flash Access
Buffer (32 bits)
Master Clock
ARM Request (16-bit)
Code Fetch
Data To ARM
Bytes 0-3
Bytes 4-7
Bytes 0-3
Bytes 0-1
Bytes 2-3
Bytes 4-5
Bytes 6-7
Bytes 8-9
Bytes 10-11
Bytes 12-13
@Byte 0
@Byte 2
@Byte 4
@Byte 6
@Byte 8
@Byte 10
@Byte 12
@Byte 14
@Byte 16
Bytes 14-15
Bytes 4-7
Bytes 8-11
Bytes 12-15
Bytes 16-19
Bytes 12-15
Flash Access
Buffer (32 bits)
Master Clock
ARM Request (16-bit)
Code Fetch
Data To ARM
Bytes 0-3
Bytes 4-7
Bytes 0-3
Bytes 2-3
Bytes 4-5
Bytes 6-7
Bytes 8-9
Bytes 10-11
@Byte 0
@Byte 4
@Byte 6
@Byte 8
@Byte 10
@Byte 12
@Byte 14
Bytes 4-7
Bytes 8-11
Bytes 12-15
1 Wait State Cycle
Bytes 0-1
1 Wait State Cycle
@Byte 2
Bytes 12-13
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AT91SAM7S256C-MU-999 功能描述:ARM微控制器 - MCU 256K Flash SRAM 64K ARM based MCU RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT
AT91SAM7S256D-AU 功能描述:ARM微控制器 - MCU 256K Flash SRAM 64K ARM based MCU RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT
AT91SAM7S256D-AU-999 制造商:Atmel Corporation 功能描述:AT91SAM7S256D-AU-999 制造商:Atmel Corporation 功能描述:LQFP, GREEN, IND TEMP, T&R, MRL D - Tape and Reel 制造商:Atmel Corporation 功能描述:IC MCU ARM7 256KB FLASH 64LQFP 制造商:Atmel Corporation 功能描述:LQFP Green IND TEMP T&R, MRL D 制造商:Atmel 功能描述:AT91SAM7S256D-AU-999
AT91SAM7S256D-MU 制造商:Atmel Corporation 功能描述:MCU 32-bit SAM7S ARM7TDMI RISC 256KB Flash 1.8V/3.3V 64-Pin QFN EP 制造商:Atmel Corporation 功能描述:QFN, GREEN, IND TEMP, MRL D - Bulk 制造商:Atmel Corporation 功能描述:IC MCU ARM7 256KB FLASH 64QFN 制造商:Atmel Corporation 功能描述:ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
AT91SAM7S256D-MU-999 制造商:Atmel Corporation 功能描述:QFN,GREEN,IND TEMP,T&R, MRL D 制造商:Atmel Corporation 功能描述:QFN,GREEN,IND TEMP,T&R, MRL D - Tape and Reel 制造商:Atmel 功能描述:ARM 制造商:Atmel Corporation 功能描述:IC MCU ARM7 256KB FLASH 64QFN 制造商:Atmel Corporation 功能描述:QFN GREEN IND TEMP T&R, MRL D
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