ATmega16U2 Atmel Corporation, ATmega16U2 Datasheet - Page 25

• Manufacturer Part Number: ATmega16U2
• Manufacturer: Atmel Corporation

Specifications of ATmega16U2

• Flash (kbytes): 16 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 21
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• 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: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

7618C–AVR–07/08
/*F************************************************************************
**
* NAME: flash_fill_temp_buffer
*--------------------------------------------------------------------------
--
* PARAMS:
* data16 :
* address:
* return:
*--------------------------------------------------------------------------
--
* PURPOSE:
* This function allows to load a word in the temporary flash buffer.
*--------------------------------------------------------------------------
--
* EXAMPLE:
* fill_temp_buffer(data16, address);
*--------------------------------------------------------------------------
--
* NOTE:
* the first paramater used the registers R16, R17
* The second parameter used the registers R18, R19
***************************************************************************
**/
flash_fill_temp_buffer:
;*F************************************************************************
**
; NAME: lock_wr_bits
;--------------------------------------------------------------------------
--
; PARAMS:
;--------------------------------------------------------------------------
--
; PURPOSE:
;**************************************************************************
**
lock_wr_bits:
RJMP
MOV
MOV
MOV
MOV
LDI
OUT SPMCSR, R20; r18 decides function
SPM
RJMP
WAIT_SPMEN
WAIT_SPMEN
R31,R19
R30,R18
R0,R17
R1,R16
R20,(1<<SPMEN)
none
R16/R17: word to load in the temporary buffer.
R18/R19: address of the word.
R16: value to write
; Store program memory
;Wait for SPMEN flag cleared
;move adress to z pointer (R31=ZH R30=ZL)
;move data16 to reg 0 and 1
; Wait for SPMEN flag cleared
25