ST STM32L0x3 User Manual

Liquid crystal display controller (LCD) RM0367
408/1043 RM0367 Rev 7
Bits 12:10 CC[2:0]: Contrast control
These bits specify one of the V
LCD
maximum voltages (independent of V
DD
). It ranges from
2.60 V to 3.51V.
000: V
LCD0
001: V
LCD1
010: V
LCD2
011: V
LCD3
100: V
LCD4
101: V
LCD5
110: V
LCD6
111: V
LCD7
Refer to the product datasheet for the V
LCDx
values.
Bits 9:7 DEAD[2:0]: Dead time duration
These bits are written by software to configure the length of the dead time between frames.
During the dead time the COM and SEG voltage levels are held at 0 V to reduce the contrast
without modifying the frame rate.
000: No dead time
001: 1 phase period dead time
010: 2 phase period dead time
......
111: 7 phase period dead time
Bits 6:4 PON[2:0]: Pulse ON duration
These bits are written by software to define the pulse duration in terms of ck_ps pulses. A short
pulse will lead to lower power consumption, but displays with high internal resistance may
need a longer pulse to achieve satisfactory contrast.
Note that the pulse will never be longer than one half prescaled LCD clock period.
000: 0
001: 1/ck_ps
010: 2/ck_ps
011: 3/ck_ps
100: 4/ck_ps
101: 5/ck_ps
110: 6/ck_ps
111: 7/ck_ps
PON duration example with LCDCLK = 32.768 kHz and PS=0x03:
000: 0 µs
001: 244 µs
010: 488 µs
011: 782 µs
100: 976 µs
101: 1.22 ms
110: 1.46 ms
111: 1.71 ms
Bit 3 UDDIE: Update display done interrupt enable
This bit is set and cleared by software.
0: LCD Update Display Done interrupt disabled
1: LCD Update Display Done interrupt enabled

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English