PCF8534AUSLASHDASLASH1 datasheet(27/47 Pages) NXP

27 / 47 page

PCF8534A_5

Product data sheet

Rev. 05 — 6 August 2009

27 of 47

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

[1]

The bank select command has no effect in 1:3 or 1:4 multiplex drive modes.

[1]

Only normal blinking can be selected in multiplexer 1:3 or 1:4 drive modes.

8.4 Display controller

The display controller executes the commands identiﬁed by the command decoder. It

contains the status registers of the PCF8534A and coordinates their effects.

The controller also loads display data into the display RAM as required by the storage

order.

Table 13.

Bank select command bit description

See Section 7.10, Section 7.11, Section 7.12, Section 7.13 and Section 7.14.

Bit

Symbol

Value

Description

Static

1:2 multiplex[1]

7 to 2

11 1110

ﬁxed value

input bank selection: storage of arriving display data

RAM bit 0

RAM bits 0 and 1

RAM bit 2

RAM bits 2 and 3

output bank selection: retrieval of LCD display data

RAM bit 0

RAM bits 0 and 1

RAM bit 2

RAM bits 2 and 3

Table 14.

Blink select command bit description

See Section 7.15.

Bit

Symbol

Value

Description

7 to 3

1 1110

ﬁxed value

blink mode selection

normal blinking[1]

blinking by alternating display RAM banks

1 to 0

BF[1:0]

blink frequency selection

off

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