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INTEDG Datasheet(PDF) 345 Page - Microchip Technology

No. de pieza INTEDG
Descripción Electrónicos  64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology
PDF  478 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

INTEDG Datasheet(HTML) 345 Page - Microchip Technology

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 2010-2012 Microchip Technology Inc.
DS41414D-page 345
PIC16(L)F1946/47
27.5.3
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
is
controlled
by
the
LCDRL
Register
(Register 27-7).
The LCDRL register allows switching between two
power modes, designated ‘A’ and ‘B’. ‘A’ Power mode
is active for a programmable time, beginning at the
time when the LCD segments transition. ‘B’ Power
mode is the remaining time before the segments or
commons change again. The LRLAT<2:0> bits select
how long, if any, that the ‘A’ Power mode is active.
Refer to Figure 27-4.
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 27-4:
LCD INTERNAL REFERENCE LADDER POWER MODE SWITCHING DIAGRAM –
TYPE A
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>
32 kHz Clock
Ladder Power
Segment Clock
LRLAT<2:0>
Segment Data
Power Mode
COM0
SEG0
COM0-SEG0
Control
V0
V1
V0
V1
V0
V1
-V1



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