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SST65P542R-8-C-SG Datasheet(PDF) 10 Page - Silicon Storage Technology, Inc |
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SST65P542R-8-C-SG Datasheet(HTML) 10 Page - Silicon Storage Technology, Inc |
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10 / 40 page  10 Advance Information Remote Controller MCU SST65P542R ©2001 Silicon Storage Technology, Inc. S71170-03-000 12/01 368 Symbol Function PA[7:0] Port A data register bit 0 to 7. These bits are for both reading and writing. Write the data to this register will output data to port A pins when it’s in output mode. If the pins are set to input mode, only the output data register is updated, port A pins are tri-stated. Reading the data from this register will read the state of port A pins when set in input mode. If the pins are set to output mode, it reads the output data register. See Table 3-2 for details. For a detailed explanation of each parallel I/O port, please refer to Section 4.0, “Parallel Input/Output Ports” on page 20. Symbol Function PB[7:0] Port B data register bit 0 to 7. These bits are for both reading and writing. Writing data to this register will output data to port B pins when it’s in output mode. If the pins are set to input mode, only the output data register is updated, port B pins are tri-stated. Reading the data from this register will read the state of port B pins when set in input mode. If the pins are set to output mode, it reads the output data register. See Table 3-2 for details. Symbol Function PC[3:0] Port C data register bit 0 to 3. These bits are for both reading and writing. Writing data to this register will output data to port C pins when it’s in output mode. If the pins are set to input mode, only output data register is updated, port C pins are tri-stated. Reading data from this register will read the state of port C pins when set in input mode. If the pins are set to output mode, it reads the output data register. See Table 3-2 for details. PORT A Data Register (PORTA) Location 76 54 32 10 Reset Value 0000H PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 00H PORT B Data Register (PORTB) Location 76 54 32 10 Reset Value 0001H PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 00H PORT C Data Register (PORTC) Location 76 54 32 10 Reset Value 0003H - - - - DDRC3 DDRC2 DDRC1 DDRC0 00H TABLE 3-2: I/O PIN FUNCTIONS AS GENERAL PURPOSE I/O Access DDRA, DDRB, DDRC Mode I/O Pin Functions Write 0 Input Data is written into the output data register. Write 1 Output Data is written into the output data register and output to the I/O pins. Read 0 Input The state of I/O is read Read 1 Output The output data register is read T3-2.0 368 |
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