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ATMEGA8U2_14 Datasheet, PDF (256/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution | |||
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ATmega8U2/16U2/32U2
Figure 25-4. Programming the EEPROM Waveforms
K
DATA
XA1
XA0
BS1
XTAL1
WR
RDY/BSY
RESET +12V
OE
PAGEL
BS2
A
G
B
C
E
B
C
E
L
0x11
ADDR. HIGH ADDR. LOW
DATA
XX
ADDR. LOW
DATA
XX
25.7.6
Reading the Flash
The algorithm for reading the Flash memory is as follows (refer to âProgramming the Flashâ on
page 253 for details on Command and Address loading):
1. A: Load Command â0000 0010â.
2. H: Load Address Extended Byte (0x00- 0xFF).
3. G: Load Address High Byte (0x00 - 0xFF).
4. B: Load Address Low Byte (0x00 - 0xFF).
5. Set OE to â0â, and BS1 to â0â. The Flash word low byte can now be read at DATA.
6. Set BS to â1â. The Flash word high byte can now be read at DATA.
7. Set OE to â1â.
25.7.7
Reading the EEPROM
The algorithm for reading the EEPROM memory is as follows (refer to âProgramming the Flashâ
on page 253 for details on Command and Address loading):
1. A: Load Command â0000 0011â.
2. G: Load Address High Byte (0x00 - 0xFF).
3. B: Load Address Low Byte (0x00 - 0xFF).
4. Set OE to â0â, and BS1 to â0â. The EEPROM Data byte can now be read at DATA.
5. Set OE to â1â.
25.7.8
Programming the Fuse Low Bits
The algorithm for programming the Fuse Low bits is as follows (refer to âProgramming the Flashâ
on page 253 for details on Command and Data loading):
1. A: Load Command â0100 0000â.
2. C: Load Data Low Byte. Bit n = â0â programs and bit n = â1â erases the Fuse bit.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
7799DâAVRâ11/10
256
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