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UPD78044F Datasheet(PDF) 89 Page - NEC |
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UPD78044F Datasheet(HTML) 89 Page - NEC |
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89 / 472 page  89 Chapter 4 Port Functions User’s Manual U16504EE1V1UD00 4.2.3 Port 2 Port 2 is an 8-bit output port with output latch. P20 to P27 goes into a high impedance state when the port mode register 2 is set to 1. Dual-function includes meter control PWM output. RESET input sets port 2 to high-impedance state. Figure 4-4 shows a block diagram of port 2. Caution: When port 2 is set to 1, the read back from output latch operation is enabled. When port 2 is set to 0, the read back from output latch operation is disabled. Figure 4-4: P20 to P27 Configurations Remarks: 1. PM : Port mode register 2. RD : Port 2 read signal 3. WR : Port 2 write signal Notes: 1. Set output latch to 0 when dual function shall be applied to output. 2. Disable dual function when the content of the output latch shall be applied to output. WRPM WRPORT RD Output Latch (P20 to P27) PM20 to PM27 Dual Function P20/SM11 to P23/SM14 Note 1 Note 2 P24/SM21 to P27/SM24 |
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