參數(shù)資料
型號: AT90USB646-AUR
廠商: Atmel
文件頁數(shù): 32/106頁
文件大?。?/td> 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/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 48
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 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
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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