PIC16C925T-SSLASHCL datasheet(95/182 Pages) MICROCHIP

95 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 93

PIC16C925/926

11.4

Operation During SLEEP

The LCD module can operate during SLEEP. The

selection 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 on both segment and common lines. Figure

11-8 shows this operation. To ensure that the LCD com-

pletes the frame, the SLEEP instruction should be exe-

cuted immediately after a LCD frame boundary. The

LCD interrupt can be used to determine the frame

boundary. See Section 11.2 for the formulas to calcu-

late the delay.

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

module will continue to display the current contents of

the LCDD registers. To allow the module to continue

operation while in SLEEP, the clock source must be

either the internal RC oscillator or Timer1 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 con-

sumption of the device will be lower due to shut-down

of the core and other peripheral functions.

FIGURE 11-8:

SLEEP ENTRY/EXIT WHEN SLPEN = 1 OR CS1:CS0 = 00

Note:

The internal RC oscillator or external

Timer1 oscillator must be used to operate

the LCD module during SLEEP.

COM0

COM1

COM3

3/3V

1/3V

0/3V

3/3V

1/3V

2/3V

1/3V

0/3V

2/3V

0/3V

3/3V

2/3V

1/3V

0/3V

SEG0

SLEEP

Instruction Execution

Wake-up

Interrupted

Frame

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