LCD Type MCU
b 7
4 0 H
4 1 H
b 6
b 5
b 4
b 3
b 2
b 1
b 0
S E G
S E G
1
0
b 7
4 0 H
4 1 H
b 6
b 5
b 4
b 3
b 2
b 1
b 0
S E G
S E G
1
0
: U n u s e d
R e a d a s "0 "
6 E H
6 F H
C O M
1
(1 /2 o r 1 /3 D u ty )
C O M
C O M
2
S E G
S E G
4 6
4 7
6 E H
6 F H
C O M
C O M
C O M
C O M
0
S E G
S E G
4 6
4 7
LCD Memory Map
-
HT49RU80/HT49CU80
The above diagrams are based on the HT49RU80/HT49CU80 devices, which can have either a
48´2, 48´3 or 47´4 format pixel drive capability, with an LCD Memory end address of either 6EH or
6FH. The HT49R70A-1/HT49C70-1/HT49C70L devices can have either a 41´2, 41´3 or 40´4 for-
mat pixel drive capability, with an LCD Memory end address of either 68H or 67H. The
HT49R50A-1/HT49C50-1/HT49C50L devices can have either a 33´2, 33´3 or 32´4 format pixel
drive capability, with an LCD Memory end address of either 60H or 5FH. The
HT49R30A-1/HT49C30-1/HT49C30L devices can have either a 19´2, 19´3 or 18´4 format pixel
drive capability, with an LCD Memory end address of either 52H or 51H. For all devices, the 4-COM
format will be automatically setup when the 1/4 duty configuration option is selected while the 2 or
3-COM format will be automatically setup if the 1/2 or 1/3 duty configuration option is selected.
0
(1 /4 D u ty )
3
2
1
Note
For all LCD type devices, if the 1/2 or 1/3 duty configuration option is selected then only three COM
connections will be provided, allowing bit 3 of each LCD Memory address to be free for general
purpose use. However, if the 1/4 duty configuration option is selected, which will provide four COM
connections but one less segment connection, then the last address of the LCD Memory will be
unused, however, it is not user accessible and if read, will return a value of
²00².
LCD Clock
The LCD clock is driven by the internal clock source f
S
, which can originate from either the WDT os-
cillator, the RTC oscillator or f
SYS
/4, the choice of which is determined by a configuration option.
For proper LCD operation, this f
S
internal clock source then passes through a divider, to provide an
LCD clock source frequency as near as possible to 4kHz.
f
S
Clock Source
WDT Oscillator
RTC Oscillator
f
SYS
/4
f
S
Y S
LCD Clock Selection
WDT/2
2
RTC/2
3
/4
2
2
~
f
S
Y S
/4
8
2
LCD Clock Frequency Selection
50
Home Index Bookmark Pages Text
Previous Next
Pages: Home Index