EM6520 Datasheet, PDF (37/55 Pages) EM Microelectronic - MARIN SA – MFP version of EM6620 Ultra Low Power Microcontroller 4x8 LCD Driver

EM6520
12.3 Free segment allocation
Each segment (SEG[8:1]) terminal outputs the time multiplexed information from its 4 segment data latches.
Data latch 1 outputs during phase1, latch 2 during phase 2, latch 3 during phase 3 and latch 4 during phase 4.
In the case of 3 to 1 multiplexing the phase 4 is not used. This phase information together with the Common
(COM[4:1]), also called Back-planes, outputs defines if a given segment is light or not. COM[1] is on during
phase 1 and off during phase 2,3,4 , COM[2] is on during phase 2 and off during phase 1,3,4 , etc.
For each segment data latch the address location within the LCD address spacing (LCD_15 ... LCD_0 -->
LcdAdr[15:0]) can be user defined.
For each segment data latch the data bus connection (DB[3:0]) can be user defined.
Segment outputs
SEG[1]
SEG[2]
SEG[3]
...
SEG[6]
SEG[7]
SEG[8]
COM[1]
DB[0], LCDAdr[0]
DB[0], LCDAdr[1]
DB[0], LCDAdr[2]
...
DB[0], LCDAdr[5]
DB[0], LCDAdr[6]
DB[0], LCDAdr[7]
COM[2]
DB[1], LCDAdr[0]
DB[1], LCDAdr[1]
DB[1], LCDAdr[2]
...
DB[1], LCDAdr[5]
DB[1], LCDAdr[6]
DB[1], LCDAdr[7]
COM[3]
DB[2], LCDAdr[0]
DB[2], LCDAdr[1]
DB[2], LCDAdr[2]
...
DB[2], LCDAdr[5]
DB[2], LCDAdr[6]
DB[2], LCDAdr[7]
COM[4]
DB[3], LCDAdr[0]
DB[3], LCDAdr[1]
DB[3], LCDAdr[2]
...
DB[3], LCDAdr[5]
DB[3], LCDAdr[6]
DB[3], LCDAdr[7]
12.4 LCD Registers
Table 12.4.1 Register RegLcdCntl1
Bit
Name
3
--
2
--
1
CkTripSel1
0
CkTripSel0
Reset
0
0
Table 12.4.2 multiplier clock frequency select
CkTripSel0
CkTripSel1
0
0
1
0
0
1
1
1
Table 12.4.3 Register RegLcdCntl2
Bit
Name
Reset
3
LCDBlank
1
2
LCDOff
1
1
Lcd4Mux
1
0
LCDExtSupply
X
(0 on POR)
LCDExtSupply is set to ‘0’ by POR only
R/W
Description
R/W
LCD multiplier clock select
R/W
LCD multiplier clock select
multiplier clock
Ck[10]
Ck[9]
Ck[8]
Ck[7]
on 32 KHz operation
512 Hz
256 Hz
128 Hz
64 Hz
R/W
Description
R/W
LCD segment outputs off
R/W
LCD off (multiplier off)
R/W
4 : 1 multiplexed
R/W
external supply for VL1, VL2 and VL3
Copyright  2002, EM Microelectronic-Marin SA
37
03/02 REV. D/449
www.emmicroelectronic.com