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SH7052 Datasheet(PDF) 697 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 697 Page - Renesas Technology Corp |
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697 / 919 page ![]() 671 19.6.2 Port E Data Register (PEDR) Bit: 15 14 13 12 11 10 9 8 PE15 DR PE14 DR PE13 DR PE12 DR PE11 DR PE10 DR PE9 DR PE8 DR Initial value: 0 0 0 0 0 0 0 0 R/W: R/W R/W R/W R/W R/W R/W R/W R/W Bit: 7 6 5 4 3 2 1 0 PE7 DR PE6 DR PE5 DR PE4 DR PE3 DR PE2 DR PE1 DR PE0 DR Initial value: 0 0 0 0 0 0 0 0 R/W: R/W R/W R/W R/W R/W R/W R/W R/W The port E data register (PEDR) is a 16-bit readable/writable register that stores port E data. Bits PE15DR to PE0DR correspond to pins PE15/A15 to PE0/A0. When a pin functions as a general output, if a value is written to PEDR, that value is output directly from the pin, and if PEDR is read, the register value is returned directly regardless of the pin state. When the POD pin is driven low, general outputs go to the high-impedance state regardless of the PEDR value. When the POD pin is driven high, the written value is output from the pin. When a pin functions as a general input, if PEDR is read the pin state, not the register value, is returned directly. If a value is written to PEDR, although that value is written into PEDR it does not affect the pin state. Table 19.10 summarizes port E data register read/write operations. PEDR is initialized to H'0000 by a power-on reset (excluding a WDT power-on reset), and in hardware standby mode. It is not initialized in software standby mode or sleep mode. |
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