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ST7628 Datasheet(PDF) 17 Page - Sitronix Technology Co., Ltd. |
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ST7628 Datasheet(HTML) 17 Page - Sitronix Technology Co., Ltd. |
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17 / 213 page  ST7628 Ver 1.4 17/213 2008/08 7. FUNCTIONAL DESCRIPTION 7.1 MICROPROCESSOR INTERFACE Chip Select Input /CS pin is chip selection. The ST7628 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 ST7628 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 7.1.1. Table 7.1.1Parallel / Serial Interface Mode I/F Mode Pin Assignment IF3 IF2 IF1 I/F Description /CS A0 E_RD RW_WR D15 to D8 Used Data Bus D1 D0 H H H 80 serial 16-bit parallel /CS A0 /RD /WR D15 ~ D8 D7 ~ 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 ~ D8 D7 ~ 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 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 ST7628 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 7.1.2. Table 7.1.2Parallel Data Transfer Common 6800-series 8080-series A0 R/W E /WR /RD Description H H ↑ H ↓ Register status read H H ↑ H ↓ Display data read out L L ↓ ↑ H Instruction write H L ↓ ↑ H Display data write |
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