AT90USB1287-MUR Atmel, AT90USB1287-MUR Datasheet - Page 251
AT90USB1287-MUR
Manufacturer Part Number
AT90USB1287-MUR
Description
MCU AVR 128K FLASH 16MHZ 64QFN
Manufacturer
Atmel
Series
AVR® 90USBr
Datasheet
1.AT90USB646-MU.pdf
(461 pages)
Specifications of AT90USB1287-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART, USB, USB OTG
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
48
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
Processor Series
AT90USBx
Core
AVR8
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATSTK525, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525, ATAVRQTOUCHX
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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21.4
21.4.1
21.4.2
7593K–AVR–11/09
General Operating Modes
Introduction
Power-on and reset
After a hardware reset, the USB controller is disabled. When enabled, the USB controller has to
run the Device Controller or the Host Controller. This is performed using the USB ID detection.
The software anyway has to select the mode (Host, Device) in order to access to the Device
controller registers or to the Host controller registers, which are multiplexed. For example, even
if the USB controller has detected a Device mode (pin ID high), the software shall select the
device mode (bit HOST cleared), otherwise it will access to the host registers. This is also true
for the Host mode.
Note:
The next diagram explains the USB controller main states on power-on:
Figure 21-9. USB controller states after reset
USB Controller state after an hardware reset is ‘Reset’. In this state:
After setting USBE, the USB Controller enters in the Host or in the Device state (according to the
USB ID pin). The selected controller is ‘Idle’.
The USB Controller can at any time be ‘stopped’ by clearing USBE. In fact, clearing USBE acts
as an hardware reset.
• If the ID pin is not connected to ground, the USB ID bit is set by hardware (internal pull up on
• The ID bit is cleared by hardware when a low level has been detected on the ID pin. The
• USBE is not set
• the USB controller clock is stopped in order to minimize the power consumption
• the USB controller is disabled,
• the USB pad is in the suspend mode,
• the Host and Device USB controllers internal states are reset.
the UID pad) and the USB Device controller is selected.
Device controller is then disabled and the Host controller enabled.
(FRZCLK=1),
For the AT90USB646/1286 products the Host mode is not included in the USB controller, and the
ID pin is not used and should be configured and used as a general I/O.
AT90USB646/1286 forced mode
Clock stopped
Device
FRZCLK=1
M acro off
USBE=1
ID=1
USBE=0
Reset
USBE=1
ID=0
AT90USB647/1287 only
USBE=0
RESET
USBE=0
Host
HW
USBE=0
<any other
state>
AT90USB64/128
251
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