PIC16F946-ESLASHMLQTP datasheet(145/330 Pages) MICROCHIP

145 / 330 page

DS41250F-page 143

PIC16F913/914/916/917/946

10.0 LIQUID CRYSTAL DISPLAY

(LCD) DRIVER MODULE

The Liquid Crystal Display (LCD) driver module

generates the timing control to drive a static or

multiplexed LCD panel. In the PIC16F913/916 devices,

the module drives the panels of up to four commons

and up to 16 segments. In the PIC16F914/917 devices,

the module drives the panels of up to four commons

and up to 24 segments. In the PIC16F946 device, the

module drives the panels of up to four commons and up

to 42 segments. The LCD module also provides control

of the LCD pixel data.

The LCD driver module supports:

• Direct driving of LCD panel

• Three LCD clock sources with selectable prescaler

• Up to four commons:

- Static (1 common)

- 1/2 multiplex (2 commons)

- 1/3 multiplex (3 commons)

- 1/4 multiplex (4 commons)

• Segments up to:

- 16 (PIC16F913/916)

- 24 (PIC16F914/917)

- 42 (PIC16F946)

• Static, 1/2 or 1/3 LCD Bias

10.1

LCD Registers

The module contains the following registers:

• LCD Control Register (LCDCON)

• LCD Phase Register (LCDPS)

• Up to 6 LCD Segment Enable Registers (LCDSEn)

• Up to 24 LCD Data Registers (LCDDATA)

TABLE 10-1:

LCD SEGMENT AND DATA

REGISTERS

The LCDCON register (Register 10-1) controls the

operation of the LCD driver module. The LCDPS

source prescaler and the type of waveform; Type-A or

Type-B.

The

LCDSE

registers

(Register 10-3)

configure the functions of the port pins.

The following LCDSE registers are available:

• LCDSE0 SE<7:0>

• LCDSE1 SE<15:8>

• LCDSE2 SE<23:16>(1)

• LCDSE3 SE<31:24>(2)

• LCDSE4 SE<39:32>(2)

• LCDSE5 SE<41:40>(2)

Once the module is initialized for the LCD panel, the

individual bits of the LCDDATA<11:0> registers are

cleared/set to represent a clear/dark pixel, respectively:

• LCDDATA0

SEG<7:0>COM0

• LCDDATA1

SEG<15:8>COM0

• LCDDATA2

SEG<23:16>COM0

• LCDDATA3

SEG<7:0>COM1

• LCDDATA4

SEG<15:8>COM1

• LCDDATA5

SEG<23:16>COM1

• LCDDATA6

SEG<7:0>COM2

• LCDDATA7

SEG<15:8>COM2

• LCDDATA8

SEG<23:16>COM2

• LCDDATA9

SEG<7:0>COM3

• LCDDATA10 SEG<15:8>COM3

• LCDDATA11 SEG<23:16>COM3

The following additional registers are available on the

PIC16F946 only:

• LCDDATA12 SEG<31:24>COM0

• LCDDATA13 SEG<39:32>COM0

• LCDDATA14 SEG<41:40>COM0

• LCDDATA15 SEG<31:24>COM1

• LCDDATA16 SEG<39:32>COM1

• LCDDATA17 SEG<41:40>COM1

• LCDDATA18 SEG<31:24>COM2

• LCDDATA19 SEG<39:32>COM2

• LCDDATA20 SEG<41:40>COM2

• LCDDATA21 SEG<31:24>COM3

• LCDDATA22 SEG<39:32>COM3

• LCDDATA23 SEG<41:40>COM3

example,

LCDDATAx

detailed

Once the module is configured, the LCDEN bit of the

LCDCON register is used to enable or disable the LCD

module. The LCD panel can also operate during Sleep

by clearing the SLPEN bit of the LCDCON register.

Note:

COM3 and SEG15 share the same

physical pin on the PIC16F913/916,

therefore SEG15 is not available when

using 1/4 multiplex displays.

Device

# of LCD Registers

Segment Enable

Data

PIC16F913/916

PIC16F914/917

PIC16F946

Note 1: PIC16F914/917 and PIC16F946 only.

2: PIC16F946 only.

Note:

The LCDDATA2, LCDDATA5, LCDDATA8

and

LCDDATA11

registers

are

not

implemented

the

PIC16F913/916

devices.

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