Cypress FM4 Series - Pull-Up Setting Register (Pcrx)

CHAPTER 12: I/O Port
598 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.2 Pull-up Setting Register (PCRx)
The PCRx register sets pull-up of a pin.
List of PCR Register Configuration
bit
31
16
15
0
Initial value
Attribute
Corresponding port
Reserved
PCR0
0x001F
R/W
P0F to P00
Reserved
PCR1
0x0000
R/W
P1F to P10
Reserved
PCR2
0x0000
R/W
P2F to P20
Reserved
PCR3
0x0000
R/W
P3F to P30
Reserved
PCR4
0x0000
R/W
P4F to P40
Reserved
PCR5
0x0000
R/W
P5F to P50
Reserved
PCR6
0x0000
R/W
P6F to P60
Reserved
PCR7
0x0000
R/W
P7F to P70
Reserved
-
-
-
-
Reserved
PCR9
0x0000
R/W
P9F to P90
Reserved
PCRA
0x0000
R/W
PAF to PA0
Reserved
PCRB
0x0000
R/W
PBF to PB0
Reserved
PCRC
0x0000
R/W
PCF to PC0
Reserved
PCRD
0x0000
R/W
PDF to PD0
Reserved
PCRE
0x0000
R/W
PEF to PE0
Reserved
PCRF
0x0000
R/W
PFF to PF0
Detailed Register Configuration
bit
31
16
15
0
Field
Reserved
PCRx
Register Function
[bit31:16] Reserved: Register bits
0x0000 is read out from these bits.
When writing these bits, set them to 0x0000.
[bit15:0] PCRx: Pull-up Setting Register x
Sets pull-up of a pin
bit
Description
Reading
Can read out the setting value of the register.
Writing
0
Disconnects the pull-up resistor of a pin.
1
When a pin is in input status (for both GPIO and peripheral functions), the pull-up resistor is
connected.
When a pin is in output status, the pull-up resistor is disconnected.