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7721 Datasheet(PDF) 443 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 443 Page - Renesas Technology Corp |
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443 / 577 page  APPLICATION 7721 Group User’s Manual 16–40 16.1 Memory connection 16.1.4 Example of I/O expansion (1) Example of port expansion circuit using M66010FP Figure 16.1.36 shows an example of a port expansion circuit using the M66010FP. Make sure that the frequency of Serial I/O transfer clock must be 1.923 MHz or less. About Serial I/O control in this expansion example is described below. In this example, 8-bit data transmission/reception is performed 3 times by using UART0, so that 24- bit port expansion is realized. Setting of UART0 is described below: q Clock synchronous serial I/O mode: Transmission/Reception enable state q Internal clock is selected. Transfer clock frequency is 1.66 MHz. q LSB first The control procedure is described below: Output “L” level from port P45. (Expanded I/O ports of the M66010FP enter a floating state by this signal. ) Output “H” level from port P45. Output “L” level from port P44. Transmit/Receive 24-bit data by using UART0. Output “H” level from port P44. Figure 16.1.37 shows the serial transfer timing between the M37721 and the M66010FP. |
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