PCF2119 Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

PCF2119

LCD controller/drivers

NXP Semiconductors. 

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

11111111

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

11111111

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

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 9 — 14 April 2011

© NXP B.V. 2011. All rights reserved.

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