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CHAPTER 9 I/O PORT
9.3.1
Port 0 Registers (PDR0, DDR0 and RDR0)
This section describes the port 0 registers.
■
Functions of Port 0 Registers
●
Port 0 data register (PDR0)
The PDR0 register indicates the state of each pin of port 0.
●
Port 0 data direction register (DDR0)
The DDR0 register specifies the direction of a data flow (input or output) at each pin (bit) of port 0. When
a DDR0 register bit is "1", the corresponding port (pin) is set as an output port. When the bit is "0", the
port (pin) is set as an input port.
●
Port 0 pull-up resistor setting register (RDR0)
The RDR0 register specifies the selection of a pull-up resistor at each pin (bit) of port 0. When a RDR0
register bit is "1", a pull-up resistor is selected for the corresponding port (pin). When the bit is "0", the
pull-up resistor is deselected.
Notes:
•
When a resource having output pins is used, the port functions as resource output pins regardless
of the value in the DDR0 register as long as the resource output enable bit corresponding to the
pins is set.
•
To use a resource having input pins, reset the port direction register bit corresponding to each
resource input pin to "0" to place the port in input mode.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......