PIC16F1933-ESLASHP datasheet(253/418 Pages) MICROCHIP

253 / 418 page

Preliminary

DS41364A-page 251

PIC16F193X/LF193X

21.4.3

AUTOMATIC POWER MODE

SWITCHING

As an LCD segment is electrically only a capacitor, cur-

rent is drawn only during the interval where the voltage

is switching. To minimize total device current, the LCD

internal reference ladder can be operated in a different

power mode for the transition portion of the duration.

This

controlled

the

LCDRL

(Register 21-7).

The LCDLAD register allows switching between two

power modes, designated ‘A’ and ‘B’. ‘A’ Power mode

is active for a programmable time, beginning at the

time win the LCD segments transition. ‘B’ Power mode

is the remaining time before the segments or com-

mons change again. The LRLAT<2:0> bits select how

long, if any, that the ‘A’ Power mode is active.

Refer

to Figure 21-4.

To implement this, the 5-bit prescaler used to divide

the 32 kHz clock down to the LCD controller’s 1 kHz

base rate is used to select the power mode.

FIGURE 21-4:

LCD INTERNAL REFERENCE LADDER POWER MODE SWITCHING DIAGRAM –

TYPE A

FIGURE 21-5:

LCD INTERNAL REFERENCE LADDER POWER MODE SWITCHING DIAGRAM –

TYPE B

Single Segment Time

‘H00

‘H01

‘H02

‘H03

‘H04

‘H05

‘H06

‘H07

‘H0E

‘H0F

‘H00

‘H01

‘H3

Power Mode A

Power Mode B

Mode A

LRLAT<2:0>

32kHz_clk

cnt[4:0]

lcd_clk

LRLAT[2:0]

Segment Data

Power Mode

Single Segment Time

‘H00

‘H01

‘H02

‘H03

‘H04

‘H05

‘H06

‘H07

‘H1E

‘H1F

‘H00

‘H01

‘H3

Power Mode A

Power Mode B

Mode A

LRLAT<2:0>

32kHz_clk

cnt[4:0]

lcd_clk

LRLAT[2:0]

Segment Data

Power Mode

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