PCF2119RUSLASH2SLASHF2 datasheet(28/79 Pages) NXP

28 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

28 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

Busy ﬂag: The busy ﬂag indicates the internal status of the PCF2119x. A logic 1

indicates that the chip is busy and further instructions will not be accepted. The busy ﬂag

is output to pin DB7 when bit RS = 0 and bit R/W = 1. Instructions should only be started

after checking that the busy ﬂag is at logic 0 or after waiting for the required number of

cycles.

Address counter: The address counter is used by both CGRAM and DDRAM, and its

value is determined by the previous Set_CGRAM and Set_DDRAM instruction. After a

read/write operation the address counter is automatically incremented or decremented

by 1. The address counter value is output to the bus (DB6 to DB0) when bit RS = 0 and bit

R/W=1.

10.2.1.3

Read_data

Read_data from CGRAM or DDRAM: Read_data reads binary 8-bit data from the

CGRAM or DDRAM. The most recent ‘set address’ command (Set_CGRAM or

Set_DDRAM) determines whether the CGRAM or DDRAM is to be read.

The Read_data instruction gates the content of the data register to the bus while pin E is

HIGH. After pin E goes LOW again, internal operation increments (or decrements) the

address counter and stores RAM data corresponding to the new address counter into the

data register.

There are only three instructions that update the data register:

• Set_CGRAM

• Set_DDRAM

• Read_data from CGRAM or DDRAM

Other instructions (e.g. Write_data, Curs_disp_shift, Clear_display and Return_home) do

not modify the value of the data register.

10.2.1.4

Write_data

Write_data to CGRAM or DDRAM: Write_data writes binary 8-bit data to the CGRAM or

the DDRAM.

Table 14.

Read_data bit description

Bit

Symbol

Value

Description

see Table 10

R/W-

7 to 0

READ_DATA

00000000 to

11111111

read data from CGRAM or DDRAM

Table 15.

Write_data bit description

Bit

Symbol

Value

Description

see Table 10

R/W-

7 to 0

WRITE_DATA 00000000 to

11111111

write data to CGRAM or DDRAM

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