Cypress FM4 Series - Extended Pin Function Setting Register 25 (EPFR25)

CHAPTER 12: I/O Port
708 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.33 Extended Pin Function Setting Register 25 (EPFR25)
The EPFR25 register assigns functions of CAN-FD.
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
MCTX2E
MCRX2S
Attribute
-
R/W
R/W
Initial value
-
00
00
Register Function
[bit31:4] Reserved: Reserved bits
0x0000000 is read from these bits.
When writing these bits, set them to 0x0000000.
[bit3:2] MCTX2E: TX2 Output Select bits
Selects output for CAN-FD TX2.
bit
Description
Reading
Reads out the register value.
Writing
00
Does not produce output of CAN-FD TX. [Initial value]
01
Uses TX2_0 at the output pin of CAN-FD TX.
10
Uses TX2_1 at the output pin of CAN-FD TX.
11
Uses TX2_2 at the output pin of CAN-FD TX.
[bit1:0] MCRX2S: RX2 Input Select bits
Selects input for CAN-FD RX2.
bit
Description
Reading
Reads out the register value.
Writing
00
Uses RX2_0 at the output pin of CAN-FD RX.
01
Same as Writing 00.
10
Uses RX2_1 at the output pin of CAN-FD RX.
11
Uses RX2_2 at the output pin of CAN-FD RX.
Notes:
− This register does not exist in TYPE1-M4, TYPE2-M4, TYPE5-M4, TYPE6-M4 products.
− This register is not initialized by deep standby transition reset.