ADE7166 datasheet(102/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 102 of 144

Table 90. Bits Controlling LCD Functionality in PSM2 Mode

LCDPSM2

LCDEN

Result

The display is off in PSM2.

The display is on in PSM2.

The display is off in PSM2.

In addition, note that the LCD configuration and data memory

is retained when the display is turned off.

Example LCD Setup

An example of how to set up the LCD peripheral for a specific

LCD is described in this section with the following parameters:

•

Type of LCD: 5 V, 4× multiplexed with 1/3 bias, 96 segment

•

Voltage generation: internal charge pump

•

Refresh rate: 64 Hz

A 96-segment LCD with 4× multiplexing requires 96/4 = 24

segment lines. Sixteen pins, FP0 to FP15, are automatically

dedicated for use as LCD segments. Eight more pins must be

chosen for the LCD function. Because the LCD has 4× multi-

plexing, all four common lines are used. As a result, COM2/FP28

and COM3/FP27 cannot be used as segment lines. Based on the

alternate functions of the pins used for FP16 through FP25,

FP16 to FP23 are chosen for the eight remaining segment lines.

These pins are enabled for LCD functionality in the LCD

Segment Enable SFR (LCDSEGE, 0x97) and LCD Segment

Enable 2 SFR (LCDSEGE2, 0xED).

To determine contrast setting for this 5 V LCD, Table 80 shows

the BIASLVL[5:0] setting that corresponds to a VC of 5 V in

1/3 bias mode. The maximal bias level setting for this LCD is

BIASLVL[5:0] = [101110].

The LCD is setup with the following 8052 code:

; setup LCD pins to have LCD functionality

MOV

LCDSEG,#FP20EN+FP21EN+FP22EN+FP23EN

MOV

LCDSEGX,#FP16EN+FP17EN+FP18EN+FP19EN

; setup LCDCON for fLCDCLK=2048Hz, 1/3 bias and 4x multiplexing

MOV

LCDCON,#BIAS+LMUX1+LMUX0

; setup LCDCONX for charge pump and BIASLVL[110111]

MOV

LCDCONX,#BIASLVL5+BIASLVL4+BIASLVL3+BIASLVL2+BIASLVL1+BIASLVL0

; set up refresh rate for 64Hz with fLCDCLK=2048Hz

MOV

LCDCLK,#FD3+FD2+FD1+FD0

; set up LCD data registers with data to be displayed using

; LCDPTR and LCDDATA registers

; turn all segments on FP27 ON and FP26 OFF

ORL

LCDCONY,#01h

; start data memory refresh

MOV

LCDDAT,#F0H

MOV

LCDPTR, #80h OR 0DH

ANL

LCDCONY,#0FEh ; end of data memory refresh

ORL

LCDCON,#LCDEN ; enable LCD

To setup the same 3.3 V LCD for use with an external resistor ladder:

; setup LCDCONX for external resistor ladder

MOV

LCDCONX,#EXTRES

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