Cypress FM4 Series - Page 627

CHAPTER 12: I/O Port
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 627
[bit1:0] Reserved: Reserved bits
0b00 is read out from these bits.
When writing these bits, set them to 0b00.
Notes:
− TIOA
Even channels are for output only.
Odd channels are for both input and output.
− TIOB
Input only.
− TIOA1, TIOA3, TIOA5, TIOA7(odd number of "A") are not bidirectional pins so that choose either
input pin or output pin for them.
When output is chosen for odd TIOA channel, input setting will be ignored.
− Example1: Use TIOA1 as an output pin:
When TIOA1 is output to TIOA1_0, select EPFR04:TIOA1E = 01.
When TIOA1 is output to TIOA1_1, select EPFR04:TIOA1E = 10.
When TIOA1 is output to TIOA1_2, select EPFR04:TIOA1E = 11.
Settings for EPFR04:TIOA1S will be ignored.
Select ADE=0, PFR=1 for selected pins (DDR will be ignored).
All the output of other peripheral function pins which are also used by selected pins must be OFF.
− Example2: When TIOA1 is used as an input pin:
Select EPFR04:TIOA1E = 00.
When TIOA1 is input from TIOA1_0, select EPFR04:TIOA1S = 00 or 01.
When TIOA1 is input from TIOA1_1, select EPFR04:TIOA1S = 10.
When TIOA1 is input from TIOA1_2, select EPFR04:TIOA1S = 11.
Select ADE=0, PFR=1 for selected pins (DDR will be ignored).
All the output of other peripheral function pins which are also used by selected pins must be OFF.
− * When a pin is set to input, the output of the pin which is also used by selected pins (GPIO, other
peripheral function pins) can be input to the base timer as Feedback with a setting not described
above.
− This register is not initialized by deep standby transition reset.