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AT90S8535 Datasheet(PDF) 84 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 84 Page - ATMEL Corporation |
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84 / 127 page  84 AT90S/LS8535 1041H–11/01 Port C Port C is an 8-bit bi-directional I/O port. Three I/O memory address locations are allocated for the Port C, one each for the Data Register – PORTC, $15($35), Data Direction Register – DDRC, $14($34) and the Port C Input Pins – PINC, $13($33). The Port C Input Pins address is read-only, while the Data Register and the Data Direction Register are read/write. All port pins have individually selectable pull-up resistors. The Port C output buffers can sink 20 mA and thus drive LED displays directly. When pins PC0 to PC7 are used as inputs and are externally pulled low, they will source current if the internal pull-up resis- tors are activated. Port C Data Register – PORTC Port C Data Direction Register – DDRC Port C Input Pins Address – PINC The Port C Input Pins address (PINC) is not a register; this address enables access to the physical value on each Port C pin. When reading PORTC, the Port C Data Latch is read and when reading PINC, the logical values present on the pins are read. Port C As General Digital I/O All eight pins in Port C have equal functionality when used as digital I/O pins. PCn, general I/O pin: The DDCn bit in the DDRC register selects the direction of this pin. If DDCn is set (one), PCn is configured as an output pin. If DDCn is cleared (zero), PCn is configured as an input pin. If PORTCn is set (one) when the pin is configured as an input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off, PORTCn has to be cleared (zero) or the pin has to be configured as an output pin.The port pins are tri-stated when a reset condition becomes active, even if the clock is not running. Note: n: 7…0, pin number Bit 7 65 43 21 0 $15 ($35) PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 PORTC Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 65 43 21 0 $14 ($34) DDC7 DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 DDRC Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 765 4321 0 $13 ($33) PINC7 PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 PINC Read/Write RR RRRR RR Initial Value N/A N/A N/A N/A N/A N/A N/A N/A Table 32. DDCn Effects on Port C Pins DDCn PORTCn I/O Pull-up Comment 0 0 Input No Tri-state (high-Z) 0 1 Input Yes PCn will source current if ext. pulled low 1 0 Output No Push-pull Zero Output 1 1 Output No Push-pull One Output |
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