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UPD78044F Datasheet(PDF) 94 Page - NEC |
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UPD78044F Datasheet(HTML) 94 Page - NEC |
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94 / 472 page  94 Chapter 4 Port Functions User’s Manual U16504EE1V1UD00 4.2.8 Port 8 This is a 8-bit input/output port with output latches. Input mode/output mode can be specified in 1-bit units with a port mode register 8. When P80 to P87 are used as input pins, pull-up resistors can be con- nected bit-wise with the pull-up resistor option register (PU8). Dual-function includes segment signal output of LCD controller/driver. RESET input sets the input mode. Port 8 block diagram is shown in Figure 4-9. Caution: When used as segment lines, set the port function PF8 according to its functions. Figure 4-9: P80 to P87 Configurations Remarks: 1. PM : Port mode register 2. RD : Port 7 read signal 3. WR : Port 7 write signal Notes: 1. Set output latch to 0 when dual function shall be applied to output. 2. Disable dual function when the comment of the output latch shall be applied to output. P80/S8 P87/S15 WRPM WRPORT RD Selector Output Latch (P80 to P87) PM80 to PM87 Dual Function Note 1 Note 2 |
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