PCF8531 Ver la hoja de datos (PDF) - Philips Electronics

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PCF8531

34 × 128 pixel matrix driver

Philips Electronics 

Philips Semiconductors

34 × 128 pixel matrix driver

Product specification

PCF8531

handbook, full pagewidth

0

1

2

128 129 130

256 257 258

384 385 386

512 513 514

0

1

0

icon data

X address

127

0

255

1

383

2

Y address

511

3

639

4

5

127

MGS471

Fig.7 Sequence of writing data bytes into RAM with horizontal addressing (V = 0).

8.18 Instructions

Only two PCF8531 registers, the Instruction Register (IR)

and the Data Register (DR) can be directly controlled by

the MPU. Before internal operation, control information is

stored temporarily in these registers to allow interfacing to

various types of MPUs which operate at different speeds

or to allow interfacing to peripheral control ICs.

The PCF8531 operation is controlled by the instructions

given in Table 1. Details are explained in subsequent

sections.

Instructions are of four types:

1. Those that define PCF8531 functions such as display

configuration, etc.

2. Those that set internal RAM addresses

3. Those that perform data transfer with internal RAM

4. Others.

In normal use, category 3 instructions are used most

frequently. Automatic incrementing by 1 of internal RAM

addresses after each data write reduces the MPU program

load.

8.18.1 RESET

After reset or internal Power-on reset (depending on

application), the LCD driver will be set to the following

state:

• Power-down mode (PD = 1)

• Horizontal addressing (V = 0)

• Display blank (D = 0; E = 0), no icon mode (IM = 0)

• Address counter X[6:0] = 0; Y[2:0] = 0

• Bias system BS[2:0] = 0

• Multiplex rate M[1:0] = 0 (Mux rate 1 : 17)

• Temperature control mode TC[2:0] = 0

• HV-gen control, HVE = 0 the HV generator is switched

off, PRS = 0 and S[1:0] = 0

• VLCD = 0 V

• RAM data is undefined

• Command page definition H[1:0] = 0.

2000 Feb 11

12

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