ST7531 データシートの表示（PDF） - Sitronix Technology Co., Ltd.
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ST7531 Datasheet PDF : 85 Pages
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ST7531
8. FUNCTIONAL DESCRIPTION
8.1 MICROPROCESSOR INTERFACE
Chip Select Input
The XCS pin is for chip selection. The ST7531 can function with an MPU when XCS is "L". In case of serial interface, the
internal shift register and the counter are reset.
8.1.1 Selecting Parallel / Serial Interface
ST7531 has six types of interface with an MPU, which are four parallel and three serial interfaces. This parallel or serial
interface is determined by IF pin as shown in table 8.1.1.
Table 8.1.1 Parallel / Serial Interface Mode
IF1 IF2 IF3 Interface type XCS
H H H 80 serial 16-bit parallel XCS
H H L 80 serial 8-bit parallel XCS
H L L 68 serial 16-bit parallel XCS
L H H 68 serial 8-bit parallel XCS
L L H 9-bit SPI mode (3 line) XCS
L L L 8-bit SPI mode (4 line) XCS
A0 /RD(E) /WR(R/W) D15 to D8 D7 to D0 SI SCL
A0 /RD
/WR D15 to D8 D7 to D0 -- --
A0 /RD
/WR
--
D7 to D0 -- --
A0 E
R/W D15 to D8 D7 to D0 -- --
A0 E
R/W
--
D7 to D0 -- --
--
--
--
--
SI SCL
A0 --
--
--
SI SCL
Note: “--” means “disabled” in pins A0, E_RD, and RW_WR, and “high impedance” in pins DB0 to DB15.
ACK
--
--
--
--
--
--
8.1.2 8- or 16-bit Parallel Interface
The ST7531 identifies the type of the data bus signals according to the combination of A0, /RD (E) and /WR (W/R) as
shown in table 8.1.2.
Table 8.1.2 Parallel Data Transfer
Common
6800-series
A0
R/W
E
H
H
H
H
L
H
L
H
H
L
L
H
8080-series
/RD
/WR
L
H
H
L
L
H
H
L
Description
Display data read out
Display data write
Register status read
Writes to internal register (instruction)
Relation between Data Bus and Gradation Data
ST7531 offers the dithered 65K, dithered 262K, and dithered 16M color display.
When using 65K, 262K, and 16M color, you can specify color for each of R, G, B using the palette function.
(1) 65K color display
1. 8-bit mode
D7 D6 D5 D4 D3 D2 D1 D0
R R R R R G G G 1st write
G G G B B B B B 2nd write
A single pixel of data is read after the second write operation as shown, and it is written in the display RAM.
2. 16-bit mode
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
R R R R R G GGGGGB B B B B
Data is acquired through the operation of writing signal, and then written to the display RAM.
Ver 1.8
16/85
2006/9/18
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