Cypress FM4 Series - Page 586

CHAPTER 12: I/O Port
586 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Table 2-2 lists pin functions which availability depends on selected I/O port functions and register setting
values.
Table 2-2 I/O Port Functions and Register Setting Values
I/O Port Function
ADE/
SPSR
/
DAE
PFR
DDR
PZR
PCR
EPFR
PDSR
Available Main Function
Available Sub Function
Special pin
(Analog input,
Analog output,
USB,
Oscillation)
N/A
1
-
-
-
Disconnect
*0
*5
GPIO function input pin
Peripheral function input pin
0
0
0
0
Valid
*1
0
1
Disconnect
GPIO function output pin
GPIO function input pin (FB)
Peripheral function input pin (FB)
1
0
Disconnect
1
1
Disconnect
Peripheral function output pin
GPIO function input pin (FB)
Peripheral function input pin (FB)
1
-
0
Disconnect
*2
1
Disconnect
Peripheral function bidirectional pin
GPIO function input pin (FB)
Peripheral function input pin (FB)
0
Valid
*3
1
Disconnect
Peripheral function input pin
GPIO function input pin
0
Valid
*4
1
Disconnect
Legends
- : Indicates that a register setting value does not affect pin functions.
Valid: Indicates that a pull-up resistor is disconnected if PCR register value is 0.
Indicates that a pull-up resistor is connected if PCR register value is 1.
Disconnect: Indicates that a pull-up resistor is disconnected regardless of PCR register value.
(FB): Indicates that an output signal of the I/O port provides feedback and the level of the I/O port
can be read from PDIR. The signal can be also used as input for peripheral functions.
*0: If the input pin of peripheral functions is selected for the I/O port, the setting is invalid.
If the output pin of peripheral functions is selected for the I/O port, the setting is invalid.
If the bidirectional pin of peripheral functions is selected for the I/O port, the setting is invalid.
*1: If the input pin of peripheral functions is selected for the I/O port, the setting is valid.
If the output pin of peripheral functions is selected for the I/O port, the setting is invalid.
If the bidirectional pin of peripheral functions is selected for the I/O port, the setting is invalid.
*2: Indicates that the output pin of peripheral functions is selected for the I/O port.
*3: Indicates that the bidirectional pin of peripheral functions is selected for the I/O port.
*4: Indicates that neither the output pin nor the bidirectional pin of peripheral functions is
selected for the I/O port.
*5: PDSR register value can select regardless of I/O port function.