AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 291
AT90USB647-MU
Manufacturer Part Number
AT90USB647-MU
Description
MCU, 8BIT, 64K FLASH, USB, 64QFN
Manufacturer
Atmel
Specifications of AT90USB647-MU
Controller Family/series
AT90
No. Of I/o's
48
Eeprom Memory Size
2KB
Ram Memory Size
4KB
Cpu Speed
16MHz
No. Of
RoHS Compliant
Core Size
8bit
Program Memory Size
64KB
Oscillator Type
External, Internal
Package
64QFN EP
Device Core
AVR
Family Name
AT90
Maximum Speed
20 MHz
Ram Size
4 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
48
Interface Type
SPI/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
Lead Free Status / Rohs Status
Details
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23.4
23.5
23.6
7593K–AVR–11/09
Device Detection
Pipe Selection
Pipe Configuration
USB host controller state after an hardware reset is ‘Reset’. When the USB controller is enabled
and the USB Host controller is selected, the USB controller is in ‘Idle’ state. In this state, the
USB Host controller waits for the Device connection, with a minimum power consumption.
The USB Pad should be in Idle mode. The macro does not need to have the PLL activated to
enter in ‘Host Ready’ state.
The Host controller enters in Suspend state when the USB bus is in Suspend state, i.e. when the
Host controller doesn’t generate the Start of Frame. In this state, the USB consumption is mini-
mum. The Host controller exits to the Suspend state when starting to generate the SOF over the
USB line.
A Device is detected by the USB controller when the USB bus if different from D+ and D- low. In
other words, when the USB Host Controller detects the Device pull-up on the D+ line. To enable
this detection, the Host Controller has to provide the Vbus power supply to the Device.
The Device Disconnection is detected by the USB Host controller when the USB Idle correspond
to D+ and D- low on the USB line.
Prior to any operation performed by the CPU, the Pipe must first be selected. This is done by
setting PNUM2:0 bits (UPNUM register) with the Pipe number which will be managed by the
CPU.
The CPU can then access to the various Pipe registers and data.
The following flow must be respected in order to activate a Pipe:
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