6 reading the flash, 7 reading the eeprom – Rainbow Electronics ATmega64M1 User Manual
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8209A–AVR–08/09
ATmega16M1/32M1/64M1
5.
E: Latch data (give PAGEL a positive pulse).
K: Repeat 3 through 5 until the entire buffer is filled.
L: Program EEPROM page
1.
Set BS1 to “0”.
2.
Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY
goes low.
3.
Wait until to RDY/BSY goes high before programming the next page (See
for signal waveforms).
Figure 28-4. Programming the EEPROM Waveforms
28.9.6
Reading the Flash
The algorithm for reading the Flash memory is as follows (refer to
for details on Command and Address loading):
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”.
28.9.7
Reading the EEPROM
The algorithm for reading the EEPROM memory is as follows (refer to
for details on Command and Address loading):
1.
A: Load Command “0000 0011”.
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 EEPROM Data byte can now be read at DATA.
5.
Set OE to “1”.
RDY/BSY
WR
OE
RESET +12V
PAGEL
BS2
0x11
ADDR. HIGH
DATA
ADDR. LOW
DATA
ADDR. LOW
DATA
XX
XA1
XA0
BS1
XTAL1
XX
A
G
B
C
E
B
C
E
L
K