參數(shù)資料
型號: AT91SAM7S256C-MU
廠商: Atmel
文件頁數(shù): 14/165頁
文件大?。?/td> 0K
描述: IC ARM7 MCU 32BIT 256K 64QFN
標準包裝: 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
110
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
Figure 19-5. Command State Chart
In order to guarantee valid operations on the Flash memory, the field Flash Microsecond Cycle Number (FMCN) in
the Flash Mode Register MC_FMR must be correctly programmed (see “MC Flash Mode Register” on page 115).
19.2.4.1
Flash Programming
Several commands can be used to program the Flash.
The Flash technology requires that an erase must be done before programming. The entire memory plane can be
erased at the same time, or a page can be automatically erased by clearing the NEBP bit in the MC_FMR register
before writing the command in the MC_FCR register.
By setting the NEBP bit in the MC_FMR register, a page can be programmed in several steps if it has been erased
before (see Figure 19-6).
Check if FRDY flag set
No
Yes
Read Status: MC_FSR
Write FCMD and PAGENB in MC_FCR
Check if LOCKE flag set
Check if FRDY flag set
No
Read Status: MC_FSR
Yes
Locking region violation
No
Check if PROGE flag set
Yes
No
Bad keyword violation and/or Invalid command
Command Successful
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