ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 23
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega32U4-16AU
Manufacturer:
MAXIM
Quantity:
1 000
Company:
Part Number:
ATmega32U4-AU
Manufacturer:
FREESCALE
Quantity:
125
Company:
Part Number:
ATmega32U4-MUR
Manufacturer:
UCC
Quantity:
1 001
Part Number:
ATmega32U4RC-MU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
7618C–AVR–07/08
;*F************************************************************************
**
; NAME: flash_page_erase_public
;--------------------------------------------------------------------------
--
; PARAMS:
;--------------------------------------------------------------------------
--
; PURPOSE:
;--------------------------------------------------------------------------
--
; NOTE:
; erase the hardware temporary temp buffer after page erase
;**************************************************************************
**
flash_page_erase_public:
;*F************************************************************************
**
; NAME: flash_rww_enable
;--------------------------------------------------------------------------
--
; PARAMS:
;--------------------------------------------------------------------------
--
; PURPOSE:
section
; after a flash prog (erase or write page)
;**************************************************************************
**
RCALL
MOV
MOV
OUT
LDI
OUTSPMCSR, R20; argument 2 decides function (r18)
SPM
RCALL
RCALL
RET
flash_rww_enable:
RCALL
LDI
OUT SPMCSR, R20 ; argument 2 decides function (r18)
SPM
RJMP
!!!!This function set the RWWSE bit after erase. Thus it
WAIT_SPMEN
R31,R17
R30,R16
RAMPZ, R18
R20,$03
flash_rww_enable
WAIT_SPMEN
R20,$11
WAIT_SPMEN
R18:17:R16: The byte address of the page
WAIT_SPMEN
none
Launch the erase sequence of the target page
Set RWSE bit. It allows to execute code in the application
;Store program memory
;Wait for SPMEN flag cleared
;move adress to z pointer (R31=ZH R30=ZL)
;(1<<PGERS) + (1<<SPMEN)))
;Wait for SPMEN flag cleared
;(1<<WWSRE) + (1<<SPMEN)))
;Store program memory
;Wait for SPMEN flag cleared
;Wait for SPMEN flag cleared
23