PCF8811MUSLASH2DASLASH1 datasheet(21/81 Pages) NXP

21 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

21 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

The Y address counter does not auto-increment in the basic command set. The counter

stops when a complete bank has been written to. In this case the Y address counter must

be set; for Y address, see Table 10. To write the next bank, see Figure 6.

When only a part of the RAM is used, both X (Xmax) and Y (Ymax) addresses can be set.

The data order in the basic command set is as deﬁned in Figure 6.

8.1.2 Extended command set

8.1.2.1

Horizontal/vertical addressing

Two different address modes are possible with the extended command set: horizontal

address mode and vertical address mode.

In the horizontal address mode (V = 0) the X address increments after each byte. After the

last X address, X wraps around to 0 and Y increments to address the next row;

see Figure 7. The number of columns (last X address) after which the wrap around must

occur can be programmed. In Figure 7 it can be seen that the X address is programmed

as 127, and the Y address is programmed as 9. With Xmax and Ymax the X and Y

addresses can be programmed while the whole RAM is not being used.

In the vertical addressing mode (V = 1) the Y address increments after each byte. After

the last Y address (Y = 9), Y wraps around to 0 and X increments to address the next

column; see Figure 8. The last Y address, after which Y wraps to 0, can be programmed.

In Figure 8 it can be seen that the X address is programmed as 127, and the Y address is

programmed as 9. With Xmax and Ymax the X and Y addresses can be programmed while

the whole RAM is not being used.

After the very last address, the address pointers wrap around to addressX=0andY=0

in both horizontal and vertical addressing modes.

Fig 6.

Sequence of writing data bytes into the RAM (basic command set)

mgw735

Y max

X max

X address

Y address

LSB

MSB

LSB

MSB

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