20T202DA1J Pacer Components, 20T202DA1J Datasheet - Page 6

• Manufacturer Part Number: 20T202DA1J
• Description: Vacuum Fluorescent Display Module
• Manufacturer: Pacer Components

2X20 LCD Compatible VFD Module
4.8 Connector Pin Assignment
4.7.3 i80 type CPU Bus Interface Timing
14 through holes are prepared for power supply and signal interface. A connector may be able to solder to the holes.
Location and dimensions are shown at Fig.-7.
Pin No.
RS
/WR
RS
/RD
DB0~DB7
DB0~DB7
10
11
12
13
14
1
2
3
4
5
6
7
8
9
R/W (/WR)
/RST (*)
Symbol
E (/RD)
GND
VCC
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
RS
10ns/Min.
10ns/Min.
t
t
SU
SU
(RS)
(RS)
Input
Input
Input
Input
I/O
I/O
-
-
Fig.-5. Data Read-out Timing for i80 Interface Mode
Fig.-4. Data Write-in Timing for i80 Interface Mode
T
Ground Terminal
Supply Power Terminal
Reserved for Reset Signal (Active Low)
If a user would like to use external reset by using this terminal then he must short-circuit the
jumper switch, JP1. i.e. /RST is signal can be used when JP1 is closed.
Register Select ("0"; Instruction Register, "1"; Data Register)
When M68 interface mode is selected (JP0; Open), this pin is to be data IN/OUT select pin.
("0"; Data Write-in, "1"; Data Read-out)
When i80 interface mode is selected (JP0; Short), this pin is to be WRITE enable pin.
(Writes data at rising edge of this signal.)
When M68 mode is selected (JP0; Open), this pin is to be Read/Write enable. (Writes data at the
falling edge and Reads data at the rising edge.)
When i80 mode is selected (JP0: Short), this signal is to be READ enable pin. (When this pin is
low level, logic "0", the effective data is output to data bus.)
These pins are used for data IN/OUT pin.
When select 4 bits transfer mode, just DB4 (pin #11) to DB7 (pin #14) are used. Data are stored
sequentially, with data transmitted first stored in upper bits (MSB).
The DB7 (pin#14) signal can be used for BUSY flag out when RS="0" and R/W="1" for M68
read-out mode.
70ns/Max.
ACC
(DATA)
30ns/Min.
70ns/Min.
t
t
WL
WL
(/WR)
(/RD)
t
20T202DA1J (Rev. 3.0)
30ns/Min.
SU
(DATA)
Effective Data Output
Valid Data Input
Page - 6 of 17
200ns/Min.
200ns/Min.
t
t
CYC
CYC
(/WR)
(/WR)
T
t
10ns/Min.
OH
H
5ns/Min.
10ns/Min.
10ns/Min.
(DATA)
(DATA)
t
t
H
H
(RS)
(RS)
100ns/Min.
100ns/Min.
t
t
WH
WH
Descriptions
(/WR)
(/RD)