Cypress FM4 Series - Special Port Setting Register (SPSR)

CHAPTER 12: I/O Port
734 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.41 Special Port Setting Register (SPSR)
The SPSR register sets a pin as a signal pin of special functions.
Register Configuration
bit
31
30
29
28
27
26
25
24
Field
Reserved
Attribute
-
Initial value
-
bit
23
22
21
20
19
18
17
16
Field
Reserved
Attribute
-
Initial value
-
bit
15
14
13
12
11
10
9
8
Field
Reserved
Attribute
-
Initial value
-
bit
7
6
5
4
3
2
1
0
Field
Reserved
USB1C
USB0C
MAINXC
SUBXC
Attribute
-
R/W
R/W
R/W
R/W
Initial value
-
0
0
01
01
Register Function
[bit31:6] Reserved: Reserved bits
0 is read from these bits.
When writing these bits, set them to 0.
[bit5] USB1C: USB (ch.1) Pin Setting Register
This bit sets a pin as a USB pin.
bit
Description
Reading
Reads out the register value.
Writing
0
Does not use two pins of UDM1 and UDP1 as USB pins but as digital input/output pins. [Initial
value]
1
Uses two pins of UDM1 and UDP1 as USB pins.
(An I/O cell will be in a state of input direction and input cut-off.)
[bit4] USB0C: USB (ch.0) Pin Setting Register
This bit sets a pin as a USB pin.
bit4
Description
Reading
Reads out the register value.
Writing
0
Does not use two pins of UDM0 and UDP0 as USB pins but as digital input/output pins. [Initial
value]
1
Uses two pins of UDM0 and UDP0 as USB pins.
(An I/O cell will be in a state of input direction and input cut-off.)