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169
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.
Содержание MB90460 Series
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Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
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Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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