Cypress FM4 Series - Port Input;Output Direction Setting Register (Ddrx)

CHAPTER 12: I/O Port
600 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.3 Port input/output Direction Setting Register (DDRx)
The DDRx register sets input/output direction of a pin.
List of DDR Register Configuration
bit
31
16
15
0
Initial value
Attribute
Corresponding port
Reserved
DDR0
0x0000
R/W
P0F to P00
Reserved
DDR1
0x0000
R/W
P1F to P10
Reserved
DDR2
0x0000
R/W
P2F to P20
Reserved
DDR3
0x0000
R/W
P3F to P30
Reserved
DDR4
0x0000
R/W
P4F to P40
Reserved
DDR5
0x0000
R/W
P5F to P50
Reserved
DDR6
0x0000
R/W
P6F to P60
Reserved
DDR7
0x0000
R/W
P7F to P70
Reserved
DDR8
0x0000
R/W
P8F to P80
Reserved
DDR9
0x0000
R/W
P9F to P90
Reserved
DDRA
0x0000
R/W
PAF to PA0
Reserved
DDRB
0x0000
R/W
PBF to PB0
Reserved
DDRC
0x0000
R/W
PCF to PC0
Reserved
DDRD
0x0000
R/W
PDF to PD0
Reserved
DDRE
0x0000
R/W
PEF to PE0
Reserved
DDRF
0x0000
R/W
PFF to PF0
Detailed Register Configuration
bit
31
16
15
0
Field
Reserved
DDRx
Register Function
[bit31:16] Reserved: Reserved bits
0x0000 is read out from these bits.
When writing these bits, set them to 0x0000.
[bit15:0] DDRx: Port input/output Direction Setting Register x
Sets input/output direction of a pin.
bit
Description
Reading
Can read out the setting value of the register.
Writing
0
Uses GPIO in input direction.
If a pin is selected as an input/output pin of peripheral functions, this setting value is invalid.
1
Uses GPIO in output direction.
If a pin is selected as an input/output pin of peripheral functions, this setting value is invalid.