PCF8532 datasheet(24/44 Pages) NXP

24 / 44 page

PCF8532_1

Product data sheet

Rev. 1 — 10 February 2009

24 of 44

NXP Semiconductors

PCF8532

Universal LCD driver for low multiplex rates

[1]

Power-on and reset value.

[1]

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

[2]

Power-on and reset value.

[1]

Power-on and reset value.

[2]

Normal blinking is assumed when the LCD multiplex drive modes 1:3 or 1:4 are selected.

[3]

Alternating RAM bank blinking does not apply in 1:3 and 1:4 multiplex drive modes.

Table 12.

Device-select command bits description

Bit

Symbol

Value

Description

7 to 2

111000

ﬁxed value

1 to 0

A[1:0]

00[1] to 11

two bits of immediate data, bits A0 to A1, are

transferred to the subaddress counter to deﬁne

one of four hardware subaddresses

Table 13.

Bank-select command bits description

Bit

Symbol

Value

Description

Static

1:2 multiplex[1]

7 to 2

111110

ﬁxed value

input bank selection; storage of arriving display data

0[2]

RAM bit 0

RAM bits 0 and 1

RAM bit 2

RAM bits 2 and 3

output bank selection; retrieval of LCD display data

0[2]

RAM bit 0

RAM bits 0 and 1

RAM bit 2

RAM bits 2 and 3

Table 14.

Blink-select command bits description

Bit

Symbol

Value

Description

7 to 3

11110

ﬁxed value

blink mode selection

0[1]

normal blinking[2]

alternate RAM bank blinking[3]

1 to 0

BF[1:0]

blink frequency selection

00[1]

off

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