PIC16F946-ESLASHMLQTP datasheet(167/330 Pages) MICROCHIP

167 / 330 page

DS41250F-page 165

PIC16F913/914/916/917/946

10.10 Operation During Sleep

The LCD module can operate during Sleep. The

selection is controlled by bit SLPEN of the LCDCON

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 on both segment and common lines.

Figure 10-18 shows this operation.

To ensure that no DC component is introduced on the

panel, the SLEEP instruction should be executed

immediately after a LCD frame boundary. For Type-B

multiplex (non-static), the LCD interrupt can be used to

determine the frame boundary. See Section 10.9

“LCD Interrupts” for the formulas to calculate the

delay. In all other modes, the LCDA bit can be used to

determine when the display is active. To use this

method, the following sequence should be used when

wanting to enter into Sleep mode:

• Clear LCDEN

• Wait for LCDA to clear

• Drive all LCD pins to inactive state using PORT

and TRIS registers

• Execute SLEEP instruction

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 10-5 shows the status of the LCD module during

a Sleep while using each of the three available clock

sources:

TABLE 10-5:

LCD MODULE STATUS

DURING SLEEP

If LCD interrupts are being generated (Type-B wave-

form with a multiplex mode not static) and LCDIE = 1,

the device will awaken from Sleep on the next frame

boundary.

Note:

When the LCDEN bit is cleared, the LCD

module will be disabled at the completion

of frame. At this time, the PORT pins will

revert to digital functionality. To minimize

power consumption due to floating digital

inputs, the LCD pins should be driven low

using the PORT and TRIS registers.

Clock Source

SLPEN

Operation

During Sleep?

T1OSC

Yes

LFINTOSC

Yes

FOSC/4

Note:

The LFINTOSC or external T1OSC

oscillator must be used to operate the LCD

module during Sleep.

PIC16F946-E/MLQTP Datasheet(PDF) 167 Page - Microchip Technology

PIC16F946-E/MLQTP Datasheet(HTML) 167 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL