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UPD78044F Datasheet(PDF) 96 Page - NEC |
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UPD78044F Datasheet(HTML) 96 Page - NEC |
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96 / 472 page  96 Chapter 4 Port Functions User’s Manual U16504EE1V1UD00 4.3 Port Function Control Registers The following three types of registers control the ports. • Port mode registers (PM0, PM2 to PM6, PM8, PM9) • Pull-up resistor option register (PU0, PU3, PU4, PU6, PU8, PU9) • Port function registers (PF3, PF4, PF8, PF9) (1) Port mode registers (PM0, PM2 to PM6, PM8, PM9) These registers are used to set port input/output in 1-bit units. PM0, PM2 to PM6, PM8 and PM9 are independently set with a 1-bit or 8-bit memory manipulation instruction. RESET input sets registers to FFH. When port pins are used as alternate-function pins, set the port mode register and output latch according to the function. Cautions: 1. Pins P10 to P14 are input-only pins. 2. As port 0 has an alternate function as external interrupt request input, when the port function output mode is specified and the output level is changed, the inter- rupt request flag is set. When the output mode is used, therefore, the interrupt mask flag should be set to 1 beforehand. |
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