參數(shù)資料
型號(hào): AT90USB646-AUR
廠商: Atmel
文件頁(yè)數(shù): 37/106頁(yè)
文件大小: 0K
描述: MCU AVR 64K FLASH 16MHZ 64TQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1,000
系列: AVR® 90USB
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 48
程序存儲(chǔ)器容量: 64KB(64K x 8)
程序存儲(chǔ)器類(lèi)型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 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-LQFP
包裝: 帶卷 (TR)
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
36
7593L–AVR–09/12
AT90USB64/128
Bit 3..2 – SRW11, SRW10: Wait-state Select bits for upper sector
The SRW11 and SRW10 bits control the number of wait-states for the upper sector of the exter-
nal memory address space, see Table 6-5.
Bit 1..0 – SRW01, SRW00: Wait-state Select bits for lower sector
The SRW01 and SRW00 bits control the number of wait-states for the lower sector of the exter-
nal memory address space, see Table 6-5.
Note:
1. n = 0 or 1 (lower/upper sector).
For further details of the timing and wait-states of the External Memory Interface, see Figures
6-6 through Figures 6-9 on page 33 to page 35 for how the setting of the SRW bits affects the
timing.
6.5.7
XMCRB – External Memory Control Register B
Bit 7– XMBK: External Memory Bus-keeper Enable
Writing XMBK to one enables the bus keeper on the AD7:0 lines. When the bus keeper is
enabled, AD7:0 will keep the last driven value on the lines even if the XMEM interface has tri-
Table 6-4.
Sector limits with different settings of SRL2..0.
SRL2
SRL1
SRL0
Sector limits
00
x
Lower sector = N/A
Upper sector = 0x2100 - 0xFFFF
01
0
Lower sector = 0x2100 - 0x3FFF
Upper sector = 0x4000 - 0xFFFF
01
1
Lower sector = 0x2100 - 0x5FFF
Upper sector = 0x6000 - 0xFFFF
10
0
Lower sector = 0x2100 - 0x7FFF
Upper sector = 0x8000 - 0xFFFF
10
1
Lower sector = 0x2100 - 0x9FFF
Upper sector = 0xA000 - 0xFFFF
11
0
Lower sector = 0x2100 - 0xBFFF
Upper sector = 0xC000 - 0xFFFF
11
1
Lower sector = 0x2100 - 0xDFFF
Upper sector = 0xE000 - 0xFFFF
Table 6-5.
Wait states
SRWn1
SRWn0
Wait states
00
No wait-states
0
1
Wait one cycle during read/write strobe
10
Wait two cycles during read/write strobe
11
Wait two cycles during read/write and wait one cycle before driving out
new address
Bit
7654
3
210
XMBK
XMM2
XMM1
XMM0
XMCRB
Read/write
R/W
R
R/W
Initial value
0000
0
000
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