10.1.1 Registers Properties
Registers can be 8, 16, or 32 bits wide. Atomic 8-bit, 16-bit, and 32-bit accesses are supported. In addition, the 8-bit quarters and 16-bit halves of a 32-bit register, and the 8-bit halves of a 16-bit register can be accessed directly.
PAC Write-Protection Register Property
Some registers are optionally write-protected by the Peripheral Access Controller (PAC). The PAC write protection is denoted by the "PAC Write-Protection" property in each individual register description. For additional information, refer to the PAC - Peripheral Access Controller.
Read-Synchronized, Write-Synchronized Register Property
Some registers (or bit fields within a register) require synchronization when read and/or written. Synchronization is denoted by the "Read-Synchronized” (bits) and "Write-Synchronized” (bits) property in each individual register description. For additional information, refer to the Register Synchronization.
Enable-Protected Register Property
Some registers (or bit fields within a register) can only be written when the peripheral is disabled. Such protection is denoted by the "Enable-Protected” (bits) property in each individual register description.
Bit field Access Properties
The access properties of bit fields within a register are defined as follows:
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |