ATmega88 Automotive Atmel Corporation, ATmega88 Automotive Datasheet - Page 261
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ATmega88 Automotive
Manufacturer Part Number
ATmega88 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.ATMEGA168_AUTOMOTIVE.pdf
(19 pages)
3.ATMEGA168_AUTOMOTIVE.pdf
(340 pages)
4.ATMEGA88_AUTOMOTIVE.pdf
(10 pages)
Specifications of ATmega88 Automotive
Flash (kbytes)
8 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
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
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)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 150
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
- AT90CAN128_AUTOMOTIVE PDF datasheet
- ATMEGA168_AUTOMOTIVE PDF datasheet #2
- ATMEGA168_AUTOMOTIVE PDF datasheet #3
- ATMEGA88_AUTOMOTIVE PDF datasheet #4
- Current page: 261 of 340
- Download datasheet (6Mb)
23.1.6
7530I–AVR–02/10
Simple Assembly Code Example for a Boot Loader
Note that the RWWSB bit will always be read as zero in ATmega48. Nevertheless, it is recom-
mended to check this bit as shown in the code example, to ensure compatibility with devices
supporting Read-While-Write.
.equ
words
.org SMALLBOOTSTART
Write_page:
Wrloop:
;-the routine writes one page of data from RAM to Flash
; the first data location in RAM is pointed to by the Y pointer
; the first data location in Flash is pointed to by the Z-pointer
;-error handling is not included
;-the routine must be placed inside the Boot space
; (at least the Do_spm sub routine). Only code inside NRWW section can
; be read during Self-Programming (Page Erase and Page Write).
;-registers used: r0, r1, temp1 (r16), temp2 (r17), looplo (r24),
; loophi (r25), spmcrval (r20)
; storing and restoring of registers is not included in the routine
; register usage can be optimized at the expense of code size
;-It is assumed that either the interrupt table is moved to the Boot
; loader section or that the interrupts are disabled.
;
ldi
rcall
;
ldi
rcall
;
ldi
ldi
ld
ld
ldi
rcall
adiw
sbiw
brne
;
subi
sbci
ldi
rcall
;
ldi
Page Erase
re-enable the RWW section
transfer data from RAM to Flash page buffer
execute Page Write
re-enable the RWW section
PAGESIZEB = PAGESIZE*2
spmcrval, (1<<PGERS) | (1<<SELFPRGEN)
Do_spm
spmcrval, (1<<RWWSRE) | (1<<SELFPRGEN)
Do_spm
looplo, low(PAGESIZEB);init loop variable
loophi, high(PAGESIZEB);not required for PAGESIZEB<=256
r0, Y+
r1, Y+
spmcrval, (1<<SELFPRGEN)
Do_spm
ZH:ZL, 2
loophi:looplo, 2
Wrloop
ZL, low(PAGESIZEB)
ZH, high(PAGESIZEB) ;not required for PAGESIZEB<=256
spmcrval, (1<<PGWRT) | (1<<SELFPRGEN)
Do_spm
spmcrval, (1<<RWWSRE) | (1<<SELFPRGEN)
ATmega48/88/168 Automotive
;PAGESIZEB is page size in BYTES, not
;use subi for PAGESIZEB<=256
;restore pointer
261
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