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UPD78044F Datasheet(PDF) 93 Page - NEC |
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UPD78044F Datasheet(HTML) 93 Page - NEC |
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93 / 472 page  93 Chapter 4 Port Functions User’s Manual U16504EE1V1UD00 4.2.7 Port 6 Port 6 is an 6-bit input/output port with output latch. P60 to P65 pins can specify the input mode/output mode in 1-bit units with the port mode register 6 (PM6). When P62 to P65 are used as input pins, pull-up resistors can be connected bit-wise with the pull-up resistor option register (PU6). The dual-function includes the asynchronous serial interface receive/transmit, the timer capture input of TM2 and the sound generator output. RESET input sets port 6 to input mode. Figure 4-8 shows block diagrams of port 6. Figure 4-8: P60 to P65 Configurations Remarks: 1. PM : Port mode register 2. RD : Port 6 read signal 3. WR : Port 6 write signal Note: Set output latch to 0 when dual function shall be applied to output. Caution: The pull-up option is not available for P60 and P61. WRPM WRPORT RD P60/SGOF/SGO, P61/SGOA/PCL, P62/RXD0, Selector Output Latch P60 to P65 PM60 to PM65 P63/TXD0, P64/TI20, P65/TI21 Note |
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