MAX32600 User’s Guide
LCD Controller
13.3 LCD Configuration
Stop mode operation is controlled via the
register "LCD_LCFG.stop_mode_en register". A write to 0 leaves stop mode function
unaffected and disabled; a write to 1 enables LCD controller operation in stop mode.
LCD data hold is configured with the
register field. Writing 0 allows display memory changes to propagate to the LCD glass; writing to 1 holds
the current data displayed on the LCD COM/SEG regardless of changes to the display memory.
The following table outlines the bit addresses for the LCD configuration registers.
LCD_LCFG Register Details
LCD_LCFG Register
Bit
Operation
Read/Write
Details
0
Display Enable (DPE)
R/W
0 = reset/disable; 1 = enable
1
LCD Operating Mode (OPM)
R/W
0 = reset/suspended; 1 = controller on
2
Stop
R/W
0 = reset/stop mode function unaffected; 1 = enable controller operation in stop mode
Reserved
3
Reserved
R/W
Always write 0
Reserved
5:4
Reserved
RO
Always 00
6
Data Source Select (Hold Data)
R/W
0 = reset/display data from LCD Memory; 1 = continue to display current data
Reserved
15:7
Reserved
RO
Always 0
13.3.4
LCD Internal Register Adjust
The
LCD internal register adjust fields
are used to select the ground connect, contrast adjustments, frame rate frequency, and the duty cycle. The internal ground
connect is enabled by writing 1 to
and disabled by writing 0. This is required to be 1 in anything other than “Static” (
== 0) if no other
external components are used as a functional equivalent to the internal ground enable. The LCD register adjust,
, is used for contrast adjustments
when using the internal ground connect by setting the value of the internal LCD ground register from 0-72kOhms. This should only be written when LCD operation is
suspended (i.e., OPM=0).
The
MAX32600
LCD output frequency is set with the
register. Equations for frame frequencies for the various possible bias modes:
• For 1/3 bias mode:
2
3
×
F
LCD
FRM
[
4:0
]+
1
• For all other bias modes:
F
LCD
FRM
[
4:0
]+
1
Note
MAX32600
F
LCD
is 512Hz.
LCD Frame Frequencies (static, 1/2, 1/4 duty) with f
LCD
= 512 Hz
Rev.1.3 April 2015
Maxim Integrated
Page 638