ATMEGA649P-AUR Atmel, ATMEGA649P-AUR Datasheet - Page 321
ATMEGA649P-AUR
Manufacturer Part Number
ATMEGA649P-AUR
Description
IC MCU AVR 64KB FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA649P-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
Quantity
Price
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27.7.5
27.7.6
8284A–AVR–10/10
Programming the EEPROM
Reading the Flash
The EEPROM is organized in pages, see
EEPROM, the program data is latched into a page buffer. This allows one page of data to be
programmed simultaneously. The programming algorithm for the EEPROM data memory is as
follows (refer to
Data loading):
1. A: Load Command “0001 0001”.
2. G: Load Address High Byte (0x00 - 0xFF).
3. B: Load Address Low Byte (0x00 - 0xFF).
4. C: Load Data (0x00 - 0xFF).
5. E: Latch data (give PAGEL a positive pulse).
6. K: Repeat 3 through 5 until the entire buffer is filled.
7. L: Program EEPROM page
Figure 27-4. Programming the EEPROM Waveforms
The algorithm for reading the Flash memory is as follows (refer to
page 317
1. A: Load Command “0000 0010”.
2. G: Load Address High Byte (0x00 - 0xFF).
3. B: Load Address Low Byte (0x00 - 0xFF).
4. Set OE to “0”, and BS1 to “0”. The Flash word low byte can now be read at DATA.
5. Set BS1 to “1”. The Flash word high byte can now be read at DATA.
6. Set OE to “1”.
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
1.Set BS1 to “0”.
2.Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY
3.Wait until to RDY/BSY goes high before programming the next page (See
goes low.
for signal waveforms).
RESET +12V
RDY/BSY
PAGEL
XTAL1
DATA
XA1
XA0
BS1
BS2
WR
OE
for details on Command and Address loading):
”Programming the Flash” on page 317
0x11
A
ADDR. HIGH
G
ADDR. LOW
B
DATA
C
Table 27-8 on page
XX
E
ADDR. LOW
B
for details on Command, Address and
DATA
C
K
XX
E
314. When programming the
”Programming the Flash” on
L
Figure 27-4
321
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