SAM7S32 Atmel Corporation, SAM7S32 Datasheet - Page 148

• Manufacturer Part Number: SAM7S32
• Manufacturer: Atmel Corporation

Specifications of SAM7S32

• Flash (kbytes): 32 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 55 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 21
• Ext Interrupts: 21
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

21.5.3
21.5.3.1
148
SAM7S Series
USB Device Port
Enumeration Process
A 48 MHz USB clock is necessary to use the USB Device port. It has been programmed ear-
lier in the device initialization procedure with PLLB configuration.
The device uses the USB communication device class (CDC) drivers to take advantage of the
installed PC RS-232 software to talk over the USB. The CDC class is implemented in all
releases of Windows
www.usb.org, describes a way to implement devices such as ISDN modems and virtual COM
ports.
The Vendor ID is Atmel’s vendor ID 0x03EB. The product ID is 0x6124. These references are
used by the host operating system to mount the correct driver. On Windows systems, the INF
files contain the correspondence between vendor ID and product ID.
The USB protocol is a master/slave protocol. This is the host that starts the enumeration send-
ing requests to the device through the control endpoint. The device handles standard requests
as defined in the USB Specification.
Table 21-2.
The device also handles some class requests defined in the CDC class.
Table 21-3.
Unhandled requests are STALLed.
Request
GET_DESCRIPTOR
SET_ADDRESS
SET_CONFIGURATION
GET_CONFIGURATION
GET_STATUS
SET_FEATURE
CLEAR_FEATURE
Request
SET_LINE_CODING
GET_LINE_CODING
SET_CONTROL_LINE_STATE
Handled Standard Requests
Handled Class Requests
®
, from Windows98SE to WindowsXP. The CDC document, available at
Definition
Returns the current device configuration value.
Sets the device address for all future device access.
Sets the device configuration.
Returns the current device configuration value.
Returns status for the specified recipient.
Used to set or enable a specific feature.
Used to clear or disable a specific feature.
Definition
Configures DTE rate, stop bits, parity and number of
character bits.
Requests current DTE rate, stop bits, parity and number
of character bits.
RS-232 signal used to tell the DCE device the DTE
device is now present.
6175L–ATARM–28-Jul-11