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MB90F463APF Datasheet(PDF) 32 Page - fujitsu semiconductor |
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MB90F463APF Datasheet(HTML) 32 Page - fujitsu semiconductor |
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32 / 88 page ![]() MB90460/465 Series 32 DS07-13714-2E 2. I/O Ports (1) Outline of I/O ports When a data register serving for control output is read, the data output from it as a control output is read regardless of the value in the direction register. Note that, if a read-modify-write instruction (such as a bit set instruction) is used to preset output data in the data register when changing its setting from input to output, the data read is not the data register latched value but the input data from the pin. Ports 0 to 4 and 6 are input/output ports which serve as inputs when the direction register value is “0” or as outputs when the value is “1”. Port 5 are input/output ports as other port when ADER is 00H. Block Diagram • Block diagram of Port 0 pins (Continued) RDR Port data register (PDR) Resource output enable Pull-up resistor About 50 K Ω Standby control (SPL = 1) PDR read PDR write DDR write DDR read Port data direction register (DDR) Output latch Pin Resource output Direction latch Direct resource input |
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