Rainbow-electronics AT90LS4433 Uživatelský manuál stáhnout pdf (Strana 89)

AT90S/LS4433

1042G–AVR–09/02

G:WriteDataHighByte

1. Set BS to “1”. This selects high data.

2. Give WR

a negative pulse. This starts programming of the data byte. RDY/BSY

goes low.

3. Wait until RDY/BSY

goes high to program the next byte.

(See Figure 64 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 to be loaded only once when writing or reading multiple

memory locations.

• Address High Byte needs to be loaded only 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 apply to EEPROM programming and Flash, EEPROM and

signature bytes reading.

Figure 63. Programming the Flash Waveforms

$10 ADDR. HIGH ADDR. LOW DATA LOWDATA

XA1

XA0

XTAL1

RDY/BSY

RESET

12V

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 124 125

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Rainbow-electronics AT90LS4433 Uživatelský manuál Strana 89