Cypress FM4 Series - Extended Pin Function Setting Register 20 (EPFR20)

CHAPTER 12: I/O Port
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 693
4.28 Extended Pin Function Setting Register 20 (EPFR20)
The EPFR 20 register assigns functions of external bus peripheral pins.
Register Configuration
bit
31
30
29
28
27
26
25
24
Field
Reserved
UED31B
Attribute
-
R/W
Initial value
-
0
bit
23
22
21
20
19
18
17
16
Field
UED30B
UED29B
UED28B
UED27B
UED26B
UED25B
UED24B
UED23B
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
Field
UED22B
UED21B
UED20B
UED19B
UED18B
UED17B
UED16B
UEDTHHB
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
bit
7
6
5
4
3
2
1
0
Field
UEDQM3E
UEDQM2E
UECSXE
UEDWEXE
UECASE
UERASE
UESMCKE
UESMCE
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
Register Function
[bit31:25] Reserved: Reserved bits
0b00000000 is read from these bits.
When writing these bits, set them to 0b00000000.
[bit24] UED31B: UED31B input/output select bit
Selects input/output for external bus data 31.
bit
Description
Reading
Reads out the register value.
Writing
0
Does not produce output user external bus MADATA31. [initial value]
Connects the input of user external bus MADATA31 to the pin.
1
Produces output of user external bus MADATA31.
Connects the input of user external bus MADATA31 to the pin.
[bit23] UED30B: UED30B input/output select bit
Selects input/output for external bus data 31.
bit
Description
Reading
Reads out the register value.
Writing
0
Does not produce output of user external bus MADATA30. [Initial value]
Connects the input of user external bus MADATA30 to the pin.
1
Produces output of user external bus MADATA30.
Connects the input of user external bus MADATA30 to the pin.