PC2119RUSLASH2 datasheet(26/60 Pages) PHILIPS

26 / 60 page

28. August 2000

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2119x-2

8.6.4

When H = 0 the chip can be programmed via the standard

11 instruction codes used in the PCF2116 and other LCD

controllers.

When H = 1 the extended range of instructions will be

used. These are mainly for controlling the display

configuration and the icons.

8.7

Set CGRAM address

‘Set CGRAM address’ sets bits 5 to 0 of the CGRAM

address ACG into the address counter (binary A5 to A0).

Data can then be written to or read from the CGRAM.

Attention: the CGRAM address uses the same address

(binary A6 to A0). With the ‘set CGRAM address’

command, only bits 5 to 0 are set. Bit 6 can be set using

the ‘set DDRAM address’ command first, or by using the

auto-increment feature during CGRAM write. All bits 6 to 0

can be read using the ‘read busy flag’ and ‘read address’

command.

When writing to the lower part of the CGRAM, ensure that

bit 6 of the address is not set (e.g. by an earlier DDRAM

write or read action).

8.8

Set DDRAM address

‘Set DDRAM address’ sets the DDRAM address ADD into

the address counter (binary A6 to A0). Data can then be

written to or read from the DDRAM.

8.9

Read busy ﬂag and read address

‘Read busy flag’ and ‘read address’ read the Busy Flag

(BF) and Address Counter (AC). BF = 1 indicates that an

internal operation is in progress. The next instruction will

not be executed until BF = 0. It is recommended that the

BF status is checked before the next write operation is

executed.

At the same time, the value of the address counter

expressed in binary A6 to A0 is read out. The address

counter is used by both CGRAM and DDRAM, and its

value is determined by the previous instruction.

8.10

Write data to CGRAM or DDRAM

‘Write data’ writes binary 8-bit data D7 to D0 to the

CGRAM or the DDRAM.

Whether the CGRAM or DDRAM is to be written into is

determined by the previous ‘set CGRAM address’ or ‘set

DDRAM address’ command. After writing, the address

automatically increments or decrements by 1, in

accordance with the entry mode. Only bits D4 to D0 of

CGRAM data are valid, bits D7 to D5 are ‘don’t care’.

8.11

Read data from CGRAM or DDRAM

‘Read data’ reads binary 8-bit data D7 to D0 from the

CGRAM or DDRAM.

The most recent ‘set address’ command determines

whether the CGRAM or DDRAM is to be read.

The ‘read data’ instruction gates the content of the Data

LOW again, internal operation increments (or decrements)

the AC and stores RAM data corresponding to the new AC

into the DR.

There are only three instructions that update the data

• ‘set CGRAM address’

• ‘set DDRAM address’

• ‘read data’ from CGRAM or DDRAM.

Other instructions (e.g. ‘write data’, ‘cursor/display shift’,

‘clear display’ and ‘return home’) do not modify the data

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