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HD6433636SW Datasheet(PDF) 169 Page - Renesas Technology Corp |
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HD6433636SW Datasheet(HTML) 169 Page - Renesas Technology Corp |
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169 / 418 page  155 Port Data Register A (PDRA) Bit 76543210 ———— PA 3 PA 2 PA 1 PA 0 Initial value 11110000 Read/Write ———— R/W R/W R/W R/W PDRA is an 8-bit register that stores data for port A pins PA 3 to PA0. If port A is read while PCRA bits are set to 1, the values stored in PDRA are directly read, regardless of the actual pin states. If port A is read while PCRA bits are cleared to 0, the pin states are read. Upon reset, PDRA is initialized to H'F0. Port Control Register A (PCRA) Bit 76543210 ———— PCRA 3 PCRA 2 PCRA 1 PCRA 0 Initial value 11110000 Read/Write ———— WWWW PCRA is an 8-bit register for controlling whether each of the port A pins PA 3 to PA0 functions as an input or output pin. Setting a PCRA bit to 1 makes the corresponding pin an output pin, while clearing the bit to 0 makes the pin an input pin. Upon reset, PCRA is initialized to H'F0. PCRA is a write-only register. All bits are read as 1. |
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