EM6520 EM Microelectronic, EM6520 Datasheet - Page 37
![no-image](/images/no-image-200.jpg)
EM6520
Manufacturer Part Number
EM6520
Description
MFP version of EM6620 Ultra Low Power Microcontroller 4x8 LCD Driver
Manufacturer
EM Microelectronic
Datasheet
1.EM6520.pdf
(55 pages)
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.
12.4 LCD Registers
Table 12.4.1 Register RegLcdCntl1
Table 12.4.2 multiplier clock frequency select
Table 12.4.3 Register RegLcdCntl2
Copyright 2002, EM Microelectronic-Marin SA
Segment outputs
Bit
Bit
3
2
1
0
CkTripSel0
3
2
1
0
SEG[1]
SEG[2]
SEG[3]
SEG[6]
SEG[7]
SEG[8]
LCDExtSupply is set to ‘0’ by POR only
...
0
1
0
1
LCDExtSupply
CkTripSel1
CkTripSel0
LCDBlank
Lcd4Mux
LCDOff
Name
Name
--
--
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[1]
CkTripSel1
...
0
0
1
1
(0 on POR)
Reset
Reset
X
1
1
1
0
0
DB[1], LCDAdr[0]
DB[1], LCDAdr[1]
DB[1], LCDAdr[2]
DB[1], LCDAdr[5]
DB[1], LCDAdr[6]
DB[1], LCDAdr[7]
multiplier clock
COM[2]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
...
Ck[10]
Ck[9]
Ck[8]
Ck[7]
37
external supply for VL1, VL2 and VL3
DB[2], LCDAdr[0]
DB[2], LCDAdr[1]
DB[2], LCDAdr[2]
DB[2], LCDAdr[5]
DB[2], LCDAdr[6]
DB[2], LCDAdr[7]
LCD multiplier clock select
LCD multiplier clock select
LCD segment outputs off
COM[3]
LCD off (multiplier off)
...
4 : 1 multiplexed
on 32 KHz operation
Description
Description
www.emmicroelectronic.com
512 Hz
256 Hz
128 Hz
64 Hz
EM6520
DB[3], LCDAdr[0]
DB[3], LCDAdr[1]
DB[3], LCDAdr[2]
DB[3], LCDAdr[5]
DB[3], LCDAdr[6]
DB[3], LCDAdr[7]
COM[4]
...
03/02 REV. D/449