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AT90S8535 Datasheet(PDF) 76 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 76 Page - ATMEL Corporation |
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76 / 127 page  76 AT90S/LS8535 1041H–11/01 I/O Ports All AVR ports have true read-modify-write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without unintention- ally changing the direction of any other pin with the SBI and CBI instructions. The same applies for changing drive value (if configured as output) or enabling/disabling of pull-up resistors (if configured as input). Port A Port A is an 8-bit bi-directional I/O port. Three I/O memory address locations are allocated for Port A, one each for the Data Register – PORTA, $1B($3B), Data Direction Register – DDRA, $1A($3A) and the Port A Input Pins – PINA, $19($39). The Port A 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 A output buffers can sink 20 mA and thus drive LED displays directly. When pins PA0 to PA7 are used as inputs and are externally pulled low, they will source current if the internal pull-up resis- tors are activated. Port A has an alternate function as analog inputs for the ADC. If some Port A pins are configured as outputs, it is essential that these do not switch when a conversion is in progress. This might corrupt the result of the conversion. During Power-down mode, the Schmitt trigger of the digital input is disconnected. This allows analog signals that are close to V CC/2 to be present during power-down without causing excessive power consumption. Port A Data Register – PORTA Port A Data Direction Register – DDRA Port A Input Pins Address – PINA The Port A Input Pins address (PINA) is not a register; this address enables access to the physical value on each Port A pin. When reading PORTA, the Port A Data Latch is read and when reading PINA, the logical values present on the pins are read. Bit 7 65 43 21 0 $1B ($3B) PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 PORTA 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 $1A ($3A) DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 DDRA 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 $19 ($39) PINA7 PINA6 PINA5 PINA4 PINA3 PINA2 PINA1 PINA0 PINA Read/Write RR RR RR RR Initial Value N/A N/A N/A N/A N/A N/A N/A N/A |
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