PCF8545ATTSLASHA datasheet(17/72 Pages) NXP

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PCF8545

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Product data sheet

Rev. 1 — 13 November 2013

17 of 72

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

The first command sent to the device after the power-on event must be the initialize

command (see Section 8.1.1).

After Power-On Reset (POR) and before enabling the display, the RAM content should be

brought to a defined state by writing meaningful content (for example, a graphic)

otherwise unwanted display artifacts may appear on the display.

8.2.2 RESET pin function

The RESET pin of the PCF8545 sets all the registers to their default state. The reset state

is given in Table 21. The RAM contents remains unchanged. After the reset signal is

removed, the PCF8545 will behave in the same manner as after Power-On Reset (POR).

See Section 8.2.1 for details.

8.2.3 Recommended start-up sequences

This chapter describes how to proceed with the initialization of the chip in different

application modes.

In general, the sequence should always be:

1. Power-on the device,

2. set the display and functional modes,

3. fill the display memory and then

4. turn on the display.

Table 21.

Reset state

Reset state of configurable bits shown in the command table format for clarity.

Associated command

Bits

mode-settings

BPS = 0

INV = 0

PD = 0

E = 0

oscillator-control

EFR = 0

COE = 0

OSC = 0

set-MUX-mode

M[1:0] = 00

set-bias-mode

B[1:0] = 00

frame-frequency

FD[4:0] = 01110

load-data-pointer

DP[5:0] = 000000

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