PCF8811USLASH2DASLASH1 datasheet(30/81 Pages) NXP

30 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

30 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

10.2.2 Read mode (only extended command set)

The read mode of the interface means that the microcontroller reads data from the

PCF8811. To do so, the microcontroller ﬁrst has to send a command (the read status

command) and then the following byte is transmitted in the opposite direction using SDO;

see Figure 24. After that, SCE is required to go HIGH before a new command is sent.

The PCF8811 samples the SDATA data on the rising SCLK edges, but shifts SDO data on

the falling SCLK edges. Thus the microcontroller is supposed to read SDO data on rising

SCLK edges.

After the read status command has been sent, the SDATA line must be set to 3-state not

later then the falling SCLK edge of the last bit; see Figure 24.

The 8th read bit is shorter than the others because it is terminated by the rising SCLK

edge; see Figure 44. The last rising SCLK edge sets SDO to 3-state after the delay

time t4.

Fig 22. Write mode: transmission of several bytes

SCE

SCLK

SDATA

DB7

D/C

DB6 DB5 DB4 DB3 DB2

DB1 DB0

001aai349

DB7

D/C

DB6 DB5 DB4 DB3 DB2

DB1 DB0 D/C

Fig 23. Write mode: interrupted by reset (RES)

001aai350

SCE

RES

SCLK

SDATA

DB7

D/C

DB6 DB5 DB4

DB7

DB7 DB6 DB5 DB4 DB3 DB2

DB1 DB0

DB6

D/C

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