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MSA921

01234

56789 10 11

0

2468 10 12 14 16 18 20 22

13579 11 13 15 17 19 21 23

0

4

8 12 16 20 24 28 32 36 40 44

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

LSB

MSB

bank 0

bank 1

bank 2

bank 3

PCF8579 system RAM

1

k

16

half-graphic mode

character mode

1 byte

4 bytes

RAM

2 bytes

4 bytes

40-bits

driver 1

driver 2

driver k

PCF8579

PCF8579

PCF8579

Fig.8 RAM access mode.