PCF2119AUSLASH2DASLASH2 datasheet(25/79 Pages) NXP

25 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

25 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

The RS bit determines which register will be accessed and the R/W bit indicates if it is a

read or a write operation (see Table 10).

[1]

There is only write access to the instruction register, but read access to the busy ﬂag (BF) and the address

counter (AC) of the BF_AC instruction (see Section 10.2.1.2).

[2]

Write and read access.

Details of the instructions are explained in subsequent sections.

10.1 Data register

The data register temporarily stores data to be read from the DDRAM and CGRAM. Prior

to being read by the Read_data instruction, data from the DDRAM or CGRAM,

corresponding to the address in the instruction register, is written to the data register.

10.2 Instruction register

The instruction register stores instruction codes such as Clear_display, Curs_disp_shift,

and address information for the Display Data RAM (DDRAM) and Character Generator

RAM (CGRAM). The instruction register can be written to but not read from by the system

controller.

The instruction register is sectioned into basic, standard and extended instructions. Bit

H = 1 of the Function_set instruction (see Section 10.2.1.1) sets the chip into extended

instruction set mode.

Table 10.

Symbol

Value

Description

instruction register[1]

data register[2]

R/W

read/write

write operation

read operation

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