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M37702S1AFP Datasheet(PDF) 39 Page - Renesas Technology Corp |
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M37702S1AFP Datasheet(HTML) 39 Page - Renesas Technology Corp |
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39 / 60 page  38 MITSUBISHI MICROCOMPUTERS M37702M2AXXXFP, M37702M2BXXXFP M37702S1AFP, M37702S1BFP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER INPUT/OUTPUT PINS Ports P8 to P0 all have a data direction register and each bit can be programmed for input or output. A pin becomes an output pin when the corresponding data direction register is set and an input pin when it is cleared. When pin programmed for output, the data is written to the port latch and it is output to the output pin. When a pin is programmed for output, the contents of the port latch is read instead of the value of the pin. Therefore, a previously output value can be read correctly even when the output “L” voltage is raised due to rea- sons such as directly driving an LED. A pin programmed for input is floating and the value input to the pin can be read. When a pin is programmed for input, the data is written only in the port latch and the pin stays floating. If an input/output pin is not used as an output port, clear the bit of the corresponding data direction register so that the pin become input mode. Figure 50 shows a block diagram of ports P8 to P0 in single-chip _ mode and the E pin output. In memory expansion mode, microprocessor mode, and evalua- tion chip mode, ports P4 to P0 are also used as address, data, and control signal pins. Refer to the section on processor modes for more details. |
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