AT90S4414/8515
73
3. Wait until RDY/BSY
goes high to program the next byte.
(See Figure 62 for signal waveforms.)
The loaded command and address are retained in the device during programming. For efficient programming, the following
should be considered.
• The command needs only be loaded once when writing or reading multiple memory locations.
• Address high byte needs only be loaded before programming a new 256 word page in the Flash.
• Skip writing the data value $FF, that is the contents of the entire Flash and EEPROM after a Chip Erase.
These considerations also applies to EEPROM programming, and Flash, EEPROM and Signature bytes reading.
Figure 61. Programming the Flash Waveforms
Figure 62. Programming the Flash Waveforms (continued)
$10 ADDR. HIGH ADDR. LOW DATA LOWDATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
RESET
OE
12V
DATA HIGH
DATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
RESET
+12V
OE
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