PCF2119VU-2-F2 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
PCF2119VU-2-F2 Datasheet PDF : 79 Pages
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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
Table 14. Read_data bit description
Bit
Symbol
Value
RS
-
1
R/W -
1
7 to 0 READ_DATA 00000000 to
1111 1111
Description
see Table 10
read data from CGRAM or DDRAM
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
Table 15. Write_data bit description
Bit
Symbol
Value
RS
-
1
R/W -
0
7 to 0 WRITE_DATA 00000000 to
1111 1111
Description
see Table 10
write data to CGRAM or DDRAM
Write_data to CGRAM or DDRAM: Write_data writes binary 8-bit data to the CGRAM or
the DDRAM.
PCF2119X_5
Product data sheet
Rev. 05 — 13 August 2009
© NXP B.V. 2009. All rights reserved.
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