AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 133

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Detach Simulation
Figure 69. Disconnect Timing
USB Interrupt System
Interrupt System Priorities
4338F–USB–08/07
D+
D-
V
IHZ
(min)
V
V
IL
SS
Controller
USB
D+
D-
Disconnected
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 V
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 V
Figure 70. USB Interrupt Control System
Device
REF
output voltage is between 3.0V and 3.6V. This output can be connected to the
EUSB
IE1.6
Interrupt Enable
AT89C5131
> = 2,5 µs
REF
IE0.7
EA
Connection
V
REF
D-
D+
Disconnect
Detected
Priority Enable
IPH/L
1.5 kΩ
00
01
10
11
Lowest Priority Interrupts
1
2
3
4
USB-B Connector
V
D-
D+
GND
CC
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