HT46R71D-1 Holtek Semiconductor, HT46R71D-1 Datasheet - Page 24

• Manufacturer Part Number: HT46R71D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

www.DataSheet4U.com
LCD Display Memory
The device provides an area of embedded data memory
for the LCD display. This area is located at 40H to 49H in
Bank 1 of the Data Memory. The bank pointer BP, en-
ables either the General Purpose Data Memory or LCD
Memory to be chosen. When BP is set to 1 , any data
written into location range 40H~49H will affect the LCD
display. When the BP is cleared to 0 , any data written
into 40H~49H will access the general purpose data
memory. The LCD display memory can be read and writ-
ten to only indirectly using MP1. When data is written
into the display data area, it is automatically read by the
LCD driver which then generates the corresponding
LCD driving signals. To turn the display on or off, a 1 or
a 0 is written to the corresponding bit of the display
memory, respectively. The figure illustrates the mapping
between the display memory and LCD pattern for the
device.
The LCD clock is driven by the IRC clock, which then
passes through a divider, the division ratio of which is
selected by configuration options to provide a range of
Rev. 1.00
Bit No.
3~7
0
1
2
ADCD0
ADCD1
ADCD2
Label
Define the chopper clock (ADCCKEN should be enable), the suggestion clock is around
10kHz.
The chopper clock define :
0: clock= (f
1: clock= (f
2: clock= (f
3: clock= (f
4: clock= (f
5: clock= (f
6: clock= (f
7: clock= (f
Reserved
SYS
SYS
SYS
SYS
SYS
SYS
SYS
SYS
/32)/1
/32)/2
/32)/4
/32)/8
/32)/16
/32)/32
/32)/64
/32)/128
ADCD (1AH) Register
24
LCD frequencies from Int.RCOSC/3 to Int.RCOSC/4.
Note that the LCD frequency is controlled by configura-
tion options, which select the internal division ratio.
LCD Driver Output
The output structure of the device LCD driver can be
either 10 2 or 10 3 selectable via configuration option
(i.e., 1/2 duty or 1/3 duty). The bias type LCD driver is R
type only. The LCD driver bias voltage can be 1/2 bias or
1/3 bias by option.
Function
Display Memory
HT46R71D-1
May 14, 2007