PIC16F913 datasheet(124/272 Pages) MICROCHIP

124 / 272 page

PIC16F917/916/914/913

DS41250E-page 122

Preliminary

9.9

Operation During Sleep

The LCD module can operate during Sleep. The selec-

tion is controlled by bit SLPEN (LCDCON<6>). Setting

the SLPEN bit allows the LCD module to go to Sleep.

Clearing the SLPEN bit allows the module to continue

to operate during Sleep.

If a SLEEP instruction is executed and SLPEN = 1, the

LCD module will cease all functions and go into a very

low-current Consumption mode. The module will stop

operation immediately and drive the minimum LCD

voltage

both

segment

and

common

lines.

Figure 9-17 shows this operation.

To ensure that no DC component is introduced on the

panel, the SLEEP instruction should be executed imme-

diately after a LCD frame boundary. The LCD interrupt

can be used to determine the frame boundary. See

Section 9.8 “LCD Interrupts” for the formulas to

calculate the delay.

If a SLEEP instruction is executed and SLPEN = 0, the

module will continue to display the current contents of

the LCDDATA registers. To allow the module to

continue operation while in Sleep, the clock source

must be either the LFINTOSC or T1OSC external

oscillator. While in Sleep, the LCD data cannot be

changed. The LCD module current consumption will

not decrease in this mode; however, the overall

consumption of the device will be lower due to shut

down of the core and other peripheral functions.

Table 9-4 shows the status of the LCD module during

a Sleep while using each of the three available clock

sources:

TABLE 9-4:

LCD MODULE STATUS

DURING SLEEP

Clock Source

SLPEN

Operation

During Sleep?

T1OSC

Yes

LFINTOSC

Yes

FOSC/4

Note:

The

LFINTOSC

external

T1OSC

oscillator must be used to operate the LCD

module during Sleep.

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