27.7.13 Peripheral Multiplexing n
Tip: The I/O pins are assembled
in pin groups (”PORT groups”) with up to 32 pins. Group 0 consists of the PA pins, group
1 is for the PB pins, etc. Each pin group has its own PORT registers, with a 0x80
address spacing. For example, the register address offset for the Data Direction (DIR)
register for group 0 (PA00 to PA31) is 0x00, and the register address offset for the DIR
register for group 1 (PB00 to PB31) is 0x80.
There are up to 16 Peripheral Multiplexing registers in each group, one for every set of two subsequent I/O lines. The n denotes the number of the set of I/O lines.
| Name: | PMUX |
| Offset: | 0x30 + n*0x01 [n=0..15] |
| Reset: | 0x00 except group 0 PMUX15 = 0x06 |
| Property: | PAC Write-Protection |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| PMUXO[3:0] | PMUXE[3:0] | ||||||||
| Access | RW | RW | RW | RW | RW | RW | RW | RW | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bits 7:4 – PMUXO[3:0] Peripheral Multiplexing for Odd-Numbered Pin
These bits select the peripheral function for odd-numbered pins (2*n + 1) of a PORT group, if the corresponding PINCFGy.PMUXEN bit is '1'.
Not all possible values for this selection may be valid. For more details, refer to the Pinout.
| PMUXO[3:0] | Name | Description |
|---|---|---|
| 0x0 | A | Peripheral function A selected |
| 0x1 | B | Peripheral function B selected |
| 0x2 | C | Peripheral function C selected |
| 0x3 | D | Peripheral function D selected |
| 0x4 | E | Peripheral function E selected |
| 0x5 | F | Peripheral function F selected |
| 0x6 | G | Peripheral function G selected |
| 0x7 | H | Peripheral function H selected |
| 0x8 | I | Peripheral function I selected |
| 0x9 | J | Peripheral function J selected |
| 0xA | K | Peripheral function K selected |
| 0xB | - | Reserved |
| 0xC | - | Reserved |
| 0xD | - | Reserved |
| 0xE-0xF | - | Reserved |
Bits 3:0 – PMUXE[3:0] Peripheral Multiplexing for Even-Numbered Pin
These bits select the peripheral function for even-numbered pins (2*n) of a PORT group, if the corresponding PINCFGy.PMUXEN bit is '1'.
Not all possible values for this selection may be valid. For more details, refer to the Pinout.
| PMUXE[3:0] | Name | Description |
|---|---|---|
| 0x0 | A | Peripheral function A selected |
| 0x1 | B | Peripheral function B selected |
| 0x2 | C | Peripheral function C selected |
| 0x3 | D | Peripheral function D selected |
| 0x4 | E | Peripheral function E selected |
| 0x5 | F | Peripheral function F selected |
| 0x6 | G | Peripheral function G selected |
| 0x7 | H | Peripheral function H selected |
| 0x8 | I | Peripheral function I selected |
| 0x9 | J | Peripheral function J selected |
| 0xA | K | Peripheral function K selected |
| 0xB | - | Reserved |
| 0xC | - | Reserved |
| 0xD | - | Reserved |
| 0xE-0xF | - | Reserved |