HT46R63 Holtek Semiconductor Inc., HT46R63 Datasheet - Page 18

• Manufacturer Part Number: HT46R63
• Description: Ht46r63/ht46c63 -- A/d With Lcd Type 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Comparator
T h e re is a co mparato r i mpl emen ted in this
microcontroller. This comparator can be enabled/dis-
abled by options. Its inputs are CMPP(+) and CMPN(-)
and outputs are CMPO and CHGO. When the CMPN in-
put level is less than the level of CMPP, the CMPO out-
put is V
level of CMPP, the CMPO output is V
The CHGO signal is combined with CMPO and
32768Hz carrier if 32768Hz RTC oscillator is applied.
This comparator also can be disabled by options. When
the system enters halt mode, the comparator is disabled
to reduce power consumption. Once the comparator is
disabled, the CHGO and CMPO will stay at VSS level.
Rev. 2.30
DD
. When the CMPN input level is higher than the
SS
.
Input/Output Ports
Display Memory
18
LCD Display Memory
The microcontroller provides an area of embedded data
memory for LCD driver. This area is located from 40H to
53H of he RAM Bank 1. Bank pointer (BP; located at
04H of the RAM) is the switch between the general pur-
pose RAM and the LCD display memory. When the BP
is set to 1 , any data written into 40H~53H (indirect ac-
cessing by using the MP1and R1) will effect the LCD
display. When the BP is cleared to 0 , any data written
into 40H to 53H will access the general purpose data
memory. The LCD display memory can be read and writ-
ten to only by indirect addressing mode using MP1.
When data is written into the display data area it is auto-
matically read by the LCD driver which then generates
the corresponding LCD driving signals. To turn the dis-
play on or off, an 1 or a 0 is written to the correspond-
ing bit of the display memory, respectively. The figure
illustrates the mapping between the display memory
and LCD pattern for the microcontroller.
HT46R63/HT46C63
March 22, 2006