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UPD78F9026A Folha de dados(PDF) 71 Page - NEC |
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UPD78F9026A Folha de dados(HTML) 71 Page - NEC |
71 / 213 page CHAPTER 4 PORT FUNCTIONS User's Manual U11919EJ3V0UM00 71 4.2 Port Configuration Ports have the following hardware configuration. Table 4-2. Port Configuration Parameter Configuration Control register Port mode register (PMm: m = 0 to 5) Pull-up resistor option register (PUO) Port Total: 34 (input/output: 34) Pull-up resistor Total: 34 (on-chip pull-up resistor can be connected by software) 4.2.1 Port 0 This is an 8-bit I/O port with output latch. Port 0 can be specified in the input or output mode in 1-bit units by using the port mode register 0 (PM0). When using P00 to P07 pins as input port pins, on-chip pull-up resistors can be connected in 8-bit units by using the pull-up resistor option register (PUO). RESET input sets port 0 to input mode. Figure 4-2 shows the block diagram of port 0. Figure 4-2. Block Diagram of P00 to P07 WRPUO RD WRPORT WRPM Output Latch (P00 to P07) PM00 to PM07 PUO0 VDD0 P-ch P00 to P07 PUO : Pull-up resistor option register PM : Port mode register RD : Port 0 read signal WR : Port 0 write signal |
Nº de peça semelhante - UPD78F9026A |
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Descrição semelhante - UPD78F9026A |
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