PCF85133USLASH2DASLASH1 datasheet(23/41 Pages) NXP

23 / 41 page

PCF85133_1

Product data sheet

Rev. 1 — 17 February 2009

23 of 41

NXP Semiconductors

PCF85133

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]

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

[2]

For the blink frequencies see Table 7.

7.18 Display controller

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

contains the device’s status registers and co-ordinates their effects. The display controller

is also responsible for loading display data into the display RAM as required by the ﬁlling

order.

Table 13.

Bank-select command bit description[1]

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

7 to 2

111110

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

11110

ﬁxed value

blink mode selection[1]

normal blinking

blinking by alternating display RAM banks

1 to 0

BF[1:0]

blink mode selection[2]

off

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