Sharp ZQ-5000

(4) (LH5073) Block Diagram
VEE
VCC
GND
CF
RIW
*AL
0’
-
+
---
VOOVDD DIS HA
,&&, fj”sy CRT 803802 801
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IN OUT IN OUT
(LH5074) Block Diagram
ZQ-5000
ZQ-5200
Supplied from
LH5073Al
VFF
VDP
VA
VM
\ VB
Vl
v2
HI
H32
Sl
_________....__._.....___._.___.__
VEE
Segment driver
VCC
6- r-i n I ” ”
XGCRT 803 802 BOI
IN OUT IN OUl
(5) Operational description
LH5073F is an LCD driver for LH5073A display expansion, and is
used in pairs with LH5073A. The display section power VFF, liquid
crystal drive power VDP,VA, VM, and synchronization signal HA of
VM and display divider are supplied from the output terminals of the
same names of LH5073A.
Display data are in 8 bit unit, and asynchronous read/write from/to the
built-in display RAM is enabled. One bit data of the display RAM
corresponds to one dot on/off of the liquid crystal panel. Display
output is provided in l/32 duty by g&segment dirver.
Display control signal VDD input and DIS input should be the same
as those of LH5073A. Every time when DIS input is turned from L to
H, the internal display divider is reset.The operation modes and
timing chart of the display circuit are shown below:
Control input
Input signal from LH5073
VDD
DIS HA VFF, VDP, VA, VM, VB
Operation mode
H l
Stop (H or L) Stop (GND level) Standby
L H Operation Operation
Display mode
L
L Operation Operation
Display OFF (Segment OFF waveform)
The internal ROM operation mode is shown below:
1 ~o,r-rt;~~;~~ 1 Data;;U/;tput 1
Operation mode
I
H H H HZ Standbylpre-charge
H H L Address input Address write
L L H Data input Data write
L H H Data output Data read
(NOTE) When reading/writing data, turn E input to “H” to bring
about pre-charge state for every cycle.
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