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ST7522 Datasheet(PDF) 8 Page - Sitronix Technology Co., Ltd. |
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ST7522 Datasheet(HTML) 8 Page - Sitronix Technology Co., Ltd. |
8 / 45 page ST7522 Ver 1.0c 8/45 2002/07/10 D DE ES SC CR RIIP PT TIIO ON N O OF F F FU UN NC CT TIIO ON NS S The MPU Interface Selecting the Interface Type With the ST7522 Series chips, data transfers are done through an 8-bit bi-directional data bus (D7 to D0) or through a serial data input (SI). Through selecting the P/S terminal polarity to the “H” or “L” it is possible to select either parallel data input or serial data input as shown in Table 1. Table 1 P/S CS1 ― CS2 A0 RD ― WR ― C86 D7 D6 D5~D0 H: Parallel Input CS1 ― CS2 A0 RD ― WR ― C86 D7 D6 D5~D0 L: Serial Input CS1 ― CS2 A0 High level High level High level SI SCL High level The Parallel Interface When the parallel interface has been selected (P/S =“H”), then it is possible to connect directly to either an 8080-system MPU or a 6800 Series MPU (as shown in Table 2) by selecting the C86 terminal to either “H” or to “L”. Table 2 C86 CS1 ― CS2 A0 RD ― WR ― D7~D0 H: 6800 Series MPU Bus CS1 ― CS2 A0 E R/W D7~D0 L: 8080 MPU Bus CS1 ― CS2 A0 RD ― WR ― D7~D0 Moreover, data bus signals are recognized by a combination of A0, RD ― (E), WR ― (R/W) signals, as show in Table 3. Table 3 Shared 6800 Series 8080 Series A0 R/W RD ― WR ― Function 1 1 0 1 Reads the display data 1 0 1 0 Writes the display data 0 1 0 1 Status read 0 0 1 0 Write control data (command) |
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