Cypress FM4 Series - Port Drive Capability Select Register (Pdsrx)

CHAPTER 12: I/O Port
738 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.43 Port Drive capability Select Register (PDSRx)
PDSRx register selects drive capability of I/O port.
List of PZR register configuration
bit
31
16
15
0
Initial value
Attribute
Corresponded
port
Reserved
PDSR0
0x0000
R/W
P0F to P00
Reserved
PDSR1
0x0000
R/W
P1F to P10
Reserved
PDSR2
0x0000
R/W
P2F to P20
Reserved
PDSR3
0x0000
R/W
P3F to P30
Reserved
PDSR4
0x0000
R/W
P4F to P40
Reserved
PDSR5
0x0000
R/W
P5F to P50
Reserved
PDSR6
0x0000
R/W
P6F to P60
Reserved
PDSR7
0x0000
R/W
P7F to P70
Reserved
PDSR8
0x0000
R/W
P8F to P80
Reserved
PDSR9
0x0000
R/W
P9F to P90
Reserved
PDSRA
0x0000
R/W
PAF to PA0
Reserved
PDSRB
0x0000
R/W
PBF to PB0
Reserved
PDSRC
0x0000
R/W
PCF to PC0
Reserved
PDSRD
0x0000
R/W
PDF to PD0
Reserved
PDSRE
0x0000
R/W
PEF to PE0
Reserved
PDSRF
0x0000
R/W
PFF to PF0
Details of Register Configuration
bit
31
16
15
0
Field
Reserved
PDSRx
Register Function
[bit31:16] Reserved: Reserved bits
0x0000 is read from these bits.
When writing these bits, set them to 0x0000.
[bit15:0] PDSRx: Port Drive capability Select Register x
Sets the drive capability of a pin.
bit
Description
Reading
Reads out the register value.
Writing
0
Set the pin drive capability for VCC=5V.
1
Set the pin drive capability for VCC=3V.
Notes:
− The "x" description of PDSRx is wildcard. It shows PDSR0, PDSR1, PDSR2, and so on.
− The function of the PDSR register is implemented only in some specific pins.
Only pins described as "PDSR register control is enabled" in remarks column of I/O circuit type of
Data Sheet can control open drain.
− Set this register if a particular function is used.
This register does not exist in TYPE1-M4, TYPE2-M4, TYPE4-M4, TYPE5-M4,TYPE6-M4
products.
− For TYEP3-M4 products, set this register depending on power supply voltage when High-Speed
SPI controller is used.
− This register is not initialized by deep standby transition reset.