3.7.1 CONFIG1
| Name: | CONFIG1 |
| Offset: | 0x300000 |
Configuration Word 1
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| FCMEN | CSWEN | CLKOUTEN | |||||||
| Access | R/W | R/W | R/W | ||||||
| Reset | 1 | 1 | 1 |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| RSTOSC[2:0] | FEXTOSC[2:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 1 | 1 | 1 | 1 | 1 | 1 | |||
Bit 13 – FCMEN Fail-Safe Clock Monitor Enable bit
| Value | Description |
|---|---|
| 1 | Fail-Safe Clock Monitor enabled |
| 0 | Fail-Safe Clock Monitor disabled |
Bit 11 – CSWEN Clock Switch Enable bit
| Value | Description |
|---|---|
| 1 | Writing to NOSC and NDIV is allowed |
| 0 | The NOSC and NDIV bits cannot be changed by user software |
Bit 8 – CLKOUTEN Clock Out Enable bit
If FEXTOSC = HS, XT, LP, then this bit is ignored.
Otherwise:
| Value | Description |
|---|---|
| 1 | CLKOUT function is disabled; I/O function on OSC2 |
| 0 | CLKOUT function is enabled; FOSC/4 clock appears at OSC2 |
Bits 6:4 – RSTOSC[2:0] Power-up Default Value for COSC bits
This value is the Reset default value for COSC and selects the oscillator first used by user software. Refer to COSC operation.
| Value | Description |
|---|---|
| 111 | EXTOSC operating per FEXTOSC bits (device manufacturing default) |
| 110 | HFINTOSC with HFFRQ = 4 MHz and CDIV = 4:1 |
| 101 | LFINTOSC |
| 100 | SOSC |
| 011 | Reserved |
| 010 | EXTOSC with 4x PLL, with EXTOSC operating per FEXTOSC bits |
| 001 | Reserved |
| 000 | HFINTOSC
with HFFRQ = 64 MHz and CDIV = 1:1. Resets COSC/NOSC to
b'110'. |
Bits 2:0 – FEXTOSC[2:0] FEXTOSC External Oscillator Mode Selection bits
| Value | Description |
|---|---|
| 111 | ECH (external clock) above 16 MHz |
| 110 | ECM (external clock) for 500 kHz to 16 MHz |
| 101 | ECL (external clock) below 500 kHz |
| 100 | Oscillator not enabled |
| 011 | Reserved (do not use) |
| 010 | HS (crystal oscillator) above 4 MHz |
| 001 | XT (crystal oscillator) above 500 kHz, below 4 MHz |
| 000 | LP (crystal oscillator) optimized for 32.768 kHz |