参数资料
型号: AT90USB647-AU
厂商: Atmel
文件页数: 37/106页
文件大小: 0K
描述: IC AVR MCU 64K 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 450
系列: AVR®
应用: USB 微控制器
核心处理器: AVR
程序存储器类型: 闪存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 线串行,SPI 串行,USART,USB
输入/输出数: 48
电源电压: 2.7 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-TQFP,64-VQFP
包装: 托盘
供应商设备封装: 64-TQFP
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名称: AT90USB647-16AU
AT90USB647-16AU-ND
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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