11
Figure1-11
LCD Hardware interfaces
figure1-18
System LCD interfaces
Serial
No.
Signal
name
Direction
Signal function description
Remarks
1
LCD_A
O
LED back facet (+)
2
LCD_K
O
LED back facet (-)
3
VSS
--
Ground
4
VDD
--
Power: (2.84V)
5
RS
O
High The BUS is in data
transmission status L:
Command status
6
R/W
O
Read/write signal.
7
E
O
Enabling signal
8
CS1
O
chip selection signal (IC1)
9
NA
Reserved pin
10
D0
O
8-Bit BUS bit
11
VSS
--
Ground
12~14
D1~D3
O
8-Bit BUS bit
15
VSS
O
Ground
16~19
D0~D7
O
8-Bit BUS bit
20
VSS
--
Ground
3. Keypad unit
In the ETS2000 series FWTs, the keypad is a peripheral component. If it is broken,
it can be directly replaced. Then note the use the correct version of the structure
suite. The interface between the system and the keypad is shown by Table 1-1.
Presented below is the circuit principle:
