This register is used to control the serial interfaces (SITFx).
| SITFEN | Serial interface enable Set and cleared by software. This bit is used to enable/disable the serial interface. - 0: Serial interface disabled - 1: Serial interface enabled |
| SCKSRC | Serial clock source Set and cleared by software. This bit is used to select the clock source of the serial interface. - 00: Serial clock source is MDF_CCK0 - 01: Serial clock source is MDF_CCK1 1x: Serial clock source is MDF_CKIx, not allowed in LF_MASTER SPI mode This field can be write-protected, please refer to Section 1.4.15: Register protection for details. |
| SITFMOD | Serial interface type Set and cleared by software. This field is used to defined the serial interface type. - 00: LF_MASTER (Low-Frequency MASTER) SPI mode - 01: Normal SPI mode - 10: Manchester mode: rising edge = logic 0, falling edge = logic 1 - 11: Manchester mode: rising edge = logic 1, falling edge = logic 0 This field can be write-protected, please refer to Section 1.4.15: Register protection for details. |
| STH | Manchester Symbol threshold / SPI threshold Set and cleared by software. This field is used for Manchester mode, in order to define the expected symbol threshold levels. Please refer to Section : Manchester mode for details on computation. In addition this field is used to define the timeout value for the clock absence detection in Normal SPI mode. Values of STH[4:0] lower than 4 are invalid. This field can be write-protected, please refer to Section 1.4.15: Register protection for details. |
| SITFACTIVE | Serial interface Active flag Set and cleared by hardware. This flag must be used by the application in order to check if the serial interface is effectively enabled (active) or not. The protected fields of this function can only be updated when the SITFACTIVE is set , please refer to Section 1.4.15: Register protection for details. The delay between a transition on SITFEN and a transition on SITFACTIVE is 2 periods of AHB clock and 2 periods of mdf_proc_ck. - 0: The serial interface is not active, and can be configured if needed - 1: The serial interface is active, and protected fields cannot be configured. |