參數(shù)資料
型號(hào): AT90USB647-MU
廠商: Atmel
文件頁數(shù): 32/106頁
文件大?。?/td> 0K
描述: IC AVR MCU 64K 64QFN
產(chǎn)品培訓(xùn)模塊: megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1,300
系列: AVR®
應(yīng)用: USB 微控制器
核心處理器: AVR
程序存儲(chǔ)器類型: 閃存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 線串行,SPI 串行,USART,USB
輸入/輸出數(shù): 48
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 64-VQFN(9x9)
配用: ATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFP
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名稱: AT90USB647-16MU
AT90USB647-16MU-ND
Q4939729A
31
7593L–AVR–09/12
AT90USB64/128
6.5
External memory interface
With all the features the External Memory Interface provides, it is well suited to operate as an
interface to memory devices such as External SRAM and Flash, and peripherals such as LCD-
display, A/D, and D/A. The main features are:
Four different wait-state settings (including no wait-state)
Independent wait-state setting for different external Memory sectors (configurable sector size)
The number of bits dedicated to address high byte is selectable
Bus keepers on data lines to minimize current consumption (optional)
6.5.1
Overview
When the eXternal MEMory (XMEM) is enabled, address space outside the internal SRAM
becomes available using the dedicated External Memory pins (see Figure 2-1 on page 6, Table
11-3 on page 78, and Table 11-9 on page 82). The memory configuration is shown in Figure 6-4.
Figure 6-4.
External memory with sector select.
6.5.2
Using the external memory interface
The interface consists of:
AD7:0: Multiplexed low-order address bus and data bus
A15:8: High-order address bus (configurable number of bits)
ALE: Address latch enable
RD: Read strobe
WR: Write strobe
The control bits for the External Memory Interface are located in two registers, the External
Memory Control Register A – XMCRA, and the External Memory Control Register B – XMCRB.
Memory configuration A
0x0000
External memory
(0-60K x 8)
0xFFFF
Internal memory
SRL[2..0]
SRW11
SRW10
SRW01
SRW00
Lower sector
Upper sector
ISRAM end
XMem start
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