ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 24

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• Eeprom (bytes): 1024
• 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: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

24
;*F************************************************************************
**
; NAME: flash_read_sig
;--------------------------------------------------------------------------
--
; PARAMS:
; Return: R16: signature value
;--------------------------------------------------------------------------
--
; PURPOSE:
addr
; passed as argument (see product data sheet)
;**************************************************************************
**
flash_read_sig:
;*F************************************************************************
**
; NAME: flash_read_fuse
;--------------------------------------------------------------------------
--
; Return: R16: fuse value
;--------------------------------------------------------------------------
--
; PURPOSE: Read fuse byte. The fuse byte is elected through the address
passed
; as argument (See product datasheet for addr value)
;**************************************************************************
**
flash_read_fuse:
RCALL
MOV
MOV
OUT
LDI
OUT SPMCSR, R20; argument 2 decides function (r18)
LPM
MOV
RJMP
RCALL
MOV
MOV
OUT
LDI
OUT SPMCSR, R20; argument 2 decides function (r18)
LPM
MOV
WAIT_SPMEN
R31,R17
R30,R16
RAMPZ, R18
R20,$21
R16, R0
WAIT_SPMEN
WAIT_SPMEN
R31,R17
R30,R16
RAMPZ, R18
R20,$09
R16, R0
Read harware signature byte. THe byte is selected trought the
;Store program memory
;Store program memory
;Wait for SPMEN flag cleared
;move adress to z pointer (R31=ZH R30=ZL)
;(1<<SPMEN) | (1<<SIGRD))
;Wait for SPMEN flag cleared
;Wait for SPMEN flag cleared
;move adress to z pointer (R31=ZH R30=ZL)
;(1<<SPMEN) | (1<<BLBSET))
;Store return value (1byte->R16 register)
;Store return value (1byte->R16 register)
7618C–AVR–07/08