AT90USB647 Atmel Corporation, AT90USB647 Datasheet - Page 16

• Manufacturer Part Number: AT90USB647
• Manufacturer: Atmel Corporation

Specifications of AT90USB647

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 48
• Ext Interrupts: 16
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 10
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

16
The API are located at absolute addresses in the USB bootloader firmware and accept specific
registers values as parameters. These parameters are compatible with a C compiler calling con-
vention and thus can be called directly with function pointer declared as in the example below:
The full assembly code for the flash API drivers is given in
C Code Example
#if (FLASH_END==0x1FFFF) //128K bytes parts
#elif (FLASH_END==0xFFFF)//64K bytes parts
#else
#endif
/
void (*boot_flash_page_erase_and_write)(unsigned long adr)=(void (*)(unsigned
long))(LAST_BOOT_ENTRY-12);
U8 (*boot_flash_read_sig) (unsigned long adr)=(U8 (*)(unsigned
long))(LAST_BOOT_ENTRY-10);
U8 (*boot_flash_read_fuse) (unsigned long adr)=(U8 (*)(unsigned
long))(LAST_BOOT_ENTRY-8);
void (*boot_flash_fill_temp_buffer) (unsigned int data,unsigned int adr)=(void
(*)(unsigned int, unsigned int))(LAST_BOOT_ENTRY-6);
void (*boot_flash_prg_page) (unsigned long adr)=(void (*)(unsigned
long))(LAST_BOOT_ENTRY-4);
void (*boot_flash_page_erase) (unsigned long adr)=(void (*)(unsigned
long))(LAST_BOOT_ENTRY-2);
void (*boot_lock_wr_bits) (unsigned char val)=(void (*)(unsigned
char))(LAST_BOOT_ENTRY);
// This function writes 0x55AA @ 0x1200 in the on-flash calling flash drivers located
in USB bootloader
void basic_flash_access(void)
{
}
/ These functions pointers are used to call functions entry points in bootloader
unsigned long address;
unsigned int temp16;
temp16=0x55AA;
address=0x12000;
(*boot_flash_fill_temp_buffer)(temp16,address);
(*boot_flash_page_erase)(address);
(*boot_flash_prg_page)(address);
#define
#define
#error You must define FLASH_END in bytes.
LAST_BOOT_ENTRY
LAST_BOOT_ENTRY
0xFFFE
0x7FFE
“Appendix-B” on page
20.
7618C–AVR–07/08