Tandy 1400LT - LCD Unit Interface; Interface Signal between LCDC and LCD Unit

LCD Unit Interface
The interface signal between LCD controller and LCD Unit is shown in Figure 4-32.
LCDC
IC30
EWCK
SCK
FLMU
LC
M
Signal
UDO - 3
LDO
- 3
CLP
LIP
FRP
FRhlB
CEO
-
’
-
-
-
IC33
.
-
-
Function
Data input signal for displaying at upper half area of LCD.
“High” level
- White color, “Low” level - Black color.
Data input signal for displaying at lower half area of LCD.
“High” level
- White color, “Low” level - Black color.
The shift clock signal of display data.
The display data (UDO
- UD3 and LDO - LD3) is input at the falling edge of this signal.
Signal for latching
1 line shift register.
DATA
& common driver DATA shift signal.
Start signal of each display cycle (Shift register DATA signal of common driver.)
A.C signal for LCD driving.
Chip-enable clock pulse of segment driver IC.
LCOG ENABLE
LOO
- 3
CN2
IC32
@
14
10
13
11
12
I
IC34. RIB etc.
LCOSV ENABLE +-E-q15
I
uoo - 3
LOO - 3
CEO
CLP
FPP
LIP
FAMB
a
Figure 4-32. Interface Signal between LCDC and LCD unit
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