ST7689-G4 View Datasheet(PDF) - Sitronix Technology Co., Ltd.
Part Name
Description
MFG CO.
ST7689-G4
Sitronix Technology Co., Ltd.
'ST7689-G4' PDF : 195 Pages View PDF
ST7689
7. FUNCTIONAL DESCRIPTION
7.1. Microprocessor Interface
Chip Select Input
/CS pin is for chip selection. The ST7689 is active when /CS=L. In serial interface mode, the internal shift register and
the counter are reset when /CS=H.
7.1.1. Selecting Parallel / Serial Interface
ST7689 has six types of interface with an MPU, which are two serial and four parallel interfaces. This parallel or serial
interface is determined by IF pin as shown in Table 1.
Table 1 Parallel / Serial Interface Mode
I/F Mode
IF3 IF2 IF1
I/F Description
Pin Assignment
/CS A0 E_RD RW_WR Used Data Bus D1 D0
H H L 80 serial 8-bit parallel
/CS A0
/RD
/WR
D7~D2
D1 D0
H H H 80 serial 16-bit parallel /CS A0
/RD
/WR
D15~D2
D1 D0
H L L 68 serial 8-bit parallel /CS A0
E
R/W
D7~D2
D1 D0
H L H 68 serial 16-bit parallel /CS A0
E
R/W
D15~D2
D1 D0
L H H 8-bit SPI mode (4 line) /CS SCL
--
--
--
A0 SI
L H L 9-bit SPI mode (3 line) /CS SCL
--
--
--
--- SI
NOTE: When these pins are set to any other combination, A0, E_RD and RW_WR inputs are disabled and D0 to D15 are to be high
impedance.
7.1.2. 8-bit or 16-bit Parallel Interface
The ST7689 identifies the type of the data bus signals according to the combination of A0, /RD (E) and /WR (W/R)
signals, as shown in Table 2.
Table 2 Parallel Data Transfer
Common
A0
H
H
L
H
6800-series
R/W
E
H
↑
H
↑
L
↓
L
↓
8080-series
/RD
/WR
↓
H
↓
H
H
↑
H
↑
Description
Display data read out
Register status read
Instruction write
Display data write
Version 1.0
Page 29 of 195
2009/10
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