PCF2113DUSLASH2SLASHF4 datasheet(11/65 Pages) NXP

11 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

11 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

[1]

The values in the table are given relative to VLCD − VSS, e.g. 3⁄4 means {3⁄4 × (VLCD − VSS)} + VSS.

8.3 Oscillator

The on-chip oscillator provides the clock signal for the display system. No external

components are required and the OSC pin must be connected to VDD1.

8.4 External clock

If an external clock is to be used, this input is at the OSC pin. The resulting display frame

frequency is given by:

Only in the Power-down mode is the clock allowed to be stopped (pin OSC connected to

VSS), otherwise the LCD is frozen in a DC state.

8.5 Power-on reset

The on-chip power-on reset block initializes the chip after power-on or power failure. This

is a synchronous reset and requires 3 oscillator cycles to be executed.

8.6 Registers

The PCF2113x has two 8-bit registers: an Instruction Register (IR) and a Data

accessed. The instruction register stores instruction codes such as ‘display clear’, ‘cursor

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

reading, data from the DDRAM or CGRAM corresponding to the address in the instruction

8.7 Busy ﬂag

The busy ﬂag indicates the internal status of the PCF2113x. 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 must only be written after checking

that the busy ﬂag is at logic 0 or waiting for the required number of cycles.

Table 6.

Bias levels as a function of multiplex rate

Multiplex

rate

Number

of levels

Bias voltages[1]

1:18

VLCD

⁄

VSS

1:9

VLCD

⁄

VSS

1:2

VLCD

⁄

VSS

fr LCD

()

osc

3072

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