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ST7637 Datasheet(PDF) 19 Page - Sitronix Technology Co., Ltd. |
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ST7637 Datasheet(HTML) 19 Page - Sitronix Technology Co., Ltd. |
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19 / 210 page  ST7637 Ver 1.6 19/210 2009/03 7. FUNCTIONAL DESCRIPTION 7.1 MICROPROCESSOR INTERFACE Chip Select Input /CS pin is chip selection. The ST7637 is active when /CS=L. In serial interface mode, the internal shift register and the counter are reset when /CS=H. 7.2 Selecting Parallel / Serial Interface ST7637 has six types of interfaces with an MPU, which are two serial and four parallel interfaces. These parallel or serial interfaces are determined by IF pin as shown in Table 7.2-1. I/F Mode Pin Assignment IF3 IF2 IF1 I/F Description /CS A0 E_RD RW_WR Used Data Bus D1 D0 H H H 80 serial 16-bit parallel /CS A0 /RD /WR D15~D2 D1 D0 H H L 80 serial 8-bit parallel /CS A0 /RD /WR D7~D2 D1 D0 H L H 68 serial 16-bit parallel /CS A0 E R/W D15~D2 D1 D0 H L L 68 serial 8-bit parallel /CS A0 E R/W D7~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 Table 7.2-1 Parallel / Serial Interface Mode 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. 7.2.1. 8-bit or 16-bit Parallel Interface The ST7637 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 7.2-2. Common 6800-series 8080-series A0 RW E /WR /RD Description H H ↑ H ↓ Display data read out H H ↑ H ↓ Register status read L L ↓ ↑ H Instruction write H L ↓ ↑ H Display data write Table 7.2-2 Parallel Data Transfer |
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