CHAPTER 12: I/O Port
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 585
Table 2-1 Register Function Descriptions
A register to set whether the I/O port will be used as a special pin (an analog input pin) or a digital input/output pin.
A register to set whether the I/O port will be used as a special pin (USB or oscillation) or a digital input/output pin.
A register to set whether the I/O port will be used as an input/output pin of GPIO function or an input/output pin of
peripheral functions.
A register to set whether a pull-up resistor of the I/O port will be connected or disconnected if the I/O port is used as a
digital input pin or a digital bidirectional pin.
A register to set whether the I/O port will be used as an input pin or an output pin if the I/O port is used as a GPIO
function pin.
Note: If a pin is selected as an I/O pin of peripheral functions, a setting value is invalid.
A register to read the level status of the I/O port.
− If the I/O port is used as a digital input pin, it reads input level.
− If the I/O port is used as a digital output pin, it reads output level.
− If the I/O port is used as an analog input pin, it always reads "0".
A register to set output level if the I/O port is used as an output pin of GPIO function.
− When "0" is set, it outputs Low level.
− When "1" is set, it outputs High level.
Note: If a pin is selected as GPIO input or input/output of peripheral functions, a setting value is invalid.
A register to select a function for an input/output of peripheral functions and set relocation function.
− Setting a peripheral output pin
It sets whether to produce output for the I/O port or not. In addition, it can also set to which I/O port a pin of peripheral functions will
be relocated for each pin.
− Setting a peripheral input pin
It can set to which I/O port a pin of peripheral functions will be relocated for each pin.
− Setting a peripheral bidirectional pin
It can set to which I/O port a pin of peripheral functions will be relocated for each pin
This register sets open the drain control of the I/O port.
− Set the I/O port to Low output when the I/O port is outputting Low level (pull-up disconnection regardless of PCR setting value)
− Set open drain control in pseudo mode by setting the I/O port on Hi-Z status when the I/O port outputs High level (pull-up
disconnection regardless of PCR setting value)
− Set the I/O port on Hi-Z status when the I/O port is used for input (pull-up disconnection regardless of PCR setting value)
Note:
This function is implemented only in some specific pins.
Only pins described as "PZR register control is enabled" in the remarks column of I/O CIRCUIT TYPE of the Data Sheet
can control the open drain.
This register controls drive capability of the I/O port.
− If the I/O port is used as a digital input pin, it selects output drive capability.
Note:
This function is implemented only in some specific pins.
Only pins described as "PDSR register control is enabled" in the remarks column of I/O CIRCUIT TYPE of the Data
Sheet can control the drive capability.
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