PCF8531USLASH2 datasheet(12/44 Pages) PHILIPS

12 / 44 page

2000 Feb 11

Philips Semiconductors

Product speciﬁcation

× 128 pixel matrix driver

PCF8531

handbook, full pagewidth

MGS471

012

128

129

130

256

257

258

384

385

386

512

513

514

icon data

127

255

383

511

639

127

X address

Y address

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 =0V

• RAM data is undefined

• Command page definition H[1:0] = 0.

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