HE84760 Datasheet, PDF (14/31 Pages) King blillion Electronics Co.,Ltd. – 8-bit Micro-controller

King Billion Electronics Co., Ltd
駿億電子股份有限公司
HE84760
HE80000 SERIES
1111
1/12
7.1. LCDC Control register
The gray scale of the LCD driver can be adjusted by GRAY field of LCD. The LCD panel can be blanked
by setting the BLANK field of LCDC register. LCD driver can be totally turned off by clearing LCDE bit
of LCDC.
LCDC bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
Field -
-
-
GRAY
BLANK LCDE
Reset -
-
-
-
-
-
1
0
Field
GRAY
BLANK
LCDE
Value
000
111
0
1
0
1
Function
LCD is darkest.
LCD is lightest.
normal display
LCD display blanked. The COM signals of LCD driver output inactive levels
(LVL4 and LVL1) while SEG signals output normal display patterns.
LCD driver disabled, LCD driver has no output signal.
LCD driver Enabled
Please note that LCD driver must be turned off before the MCU goes into sleep mode. In other words,
user must clear the bit 0 (LCDE bit) of LCDC to turn off LCD driving circuit before setting bit6 of OP1
to enter sleep mode. Large current might happen if the procedure is not followed.
Please note that LCD driver uses slow clock as clock source. The LCD display would not display
normally if it worked in Fast clock only mode as the LCD refresh action would be too fast.
8. Oscillators
The MCU is equipped with two clock sources with a variety of selections on the types of oscillators to
choose from. So that system designer can select oscillator types based on the cost target, timing accuracy
requirements etc. Crystal, Resonator or the RC oscillator can be used as fast clock source, components
should be placed as close to the pins as possible. The type of oscillator used is selected by mask option
MO_FXTAL.
MO_FXTAL
0
1
Fast clock type
RC Oscillator.
Crystal Oscillator.
August 15, 2003
Page 14 of 31
V1.2
This specification is subject to change without notice. Please contact sales person for the latest version before use.