AT89C5131A-RDTIL datasheet(133/186 Pages) ATMEL

tên linh kiện	AT89C5131A-RDTIL

Giải thích chi tiết về linh kiện	8-bit Flash Microcontroller with Full Speed USB Device

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133

AT89C5131A-L

4338F–USB–08/07

Detach Simulation

In order to be re-enumerated by the Host, the AT89C5131A-L has the possibility to sim-

ulate a DETACH - ATTACH of the USB bus.

The VREF output voltage is between 3.0V and 3.6V. This output can be connected to the

D+ pull-up as shown in Figure 68. This output can be put in high-impedance when the

DETACH bit is set to 1 in the USBCON register. Maintaining this output in high imped-

ance for more than 3 µs will simulate the disconnection of the device. When resetting

the DETACH bit, an attach is then simulated.

Figure 68. Example of VREF Connection

Figure 69. Disconnect Timing

USB Interrupt System

Interrupt System Priorities

Figure 70. USB Interrupt Control System

D-

D+

D-

D+

GND

REF

1.5 kΩ

USB-B Connector

AT89C5131

D+

D-

IHZ(min)

Device

Disconnected

Disconnect

Detected

> = 2,5 µs

EUSB

IE1.6

IE0.7

USB

Controller

IPH/L

Interrupt Enable

Lowest Priority Interrupts

Priority Enable

D+

D-

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