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PCF8579
driver 1
PCF8579
driver 2
PCF8579
driver k
RAM
4 bytes
40-bits
1 byte 0 1 2 3 4 5 6 7 8 9 10 11
2 bytes
0 2 4 6 8 10 12 14 16 18 20 22
1 3 5 7 9 11 13 15 17 19 21 23
PCF8579 system RAM
1 k 16
character mode
half-graphic mode
bank 0
bank 1
bank 2
bank 3
LSB
MSB
0 4 8 12 16 20 24 28 32 36 40 44
4 bytes
1 5 9 13 17 21 25 29 33 37 41 45
2 6 10 14 18 22 26 30 34 38 42 46
3 7 11 15 19 23 27 31 35 39 43 47
RAM data bytes are
written or read as
indicated above
full-graphic mode
Fig.8 RAM access mode.
MSA921