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ST72260G Datasheet(PDF) 93 Page - STMicroelectronics |
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ST72260G Datasheet(HTML) 93 Page - STMicroelectronics |
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93 / 171 page  ST72260G, ST72262G, ST72264G 93/171 SERIAL COMMUNICATIONS INTERFACE (Cont’d) 11.5.7 Register Description STATUS REGISTER (SCISR) Read Only Reset Value: 1100 0000 (C0h) Bit 7 = TDRE Transmit data register empty. This bit is set by hardware when the content of the TDR register has been transferred into the shift register. An interrupt is generated if the TIE bit=1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register fol- lowed by a write to the SCIDR register). 0: Data is not transferred to the shift register 1: Data is transferred to the shift register Note: Data will not be transferred to the shift reg- ister unless the TDRE bit is cleared. Bit 6 = TC Transmission complete. This bit is set by hardware when transmission of a frame containing Data, a Preamble or a Break is complete. An interrupt is generated if TCIE=1 in the SCICR2 register. It is cleared by a software se- quence (an access to the SCISR register followed by a write to the SCIDR register). 0: Transmission is not complete 1: Transmission is complete Note: TC is not set after the transmission of a Pre- amble or a Break. Bit 5 = RDRF Received data ready flag. This bit is set by hardware when the content of the RDR register has been transferred to the SCIDR register. An interrupt is generated if RIE=1 in the SCICR2 register. It is cleared by a software se- quence (an access to the SCISR register followed by a read to the SCIDR register). 0: Data is not received 1: Received data is ready to be read Bit 4 = IDLE Idle line detect. This bit is set by hardware when a Idle Line is de- tected. An interrupt is generated if the ILIE=1 in the SCICR2 register. It is cleared by a software se- quence (an access to the SCISR register followed by a read to the SCIDR register). 0: No Idle Line is detected 1: Idle Line is detected Note: The IDLE bit will not be set again until the RDRF bit has been set itself (i.e. a new idle line oc- curs). Bit 3 = OR Overrun error. This bit is set by hardware when the word currently being received in the shift register is ready to be transferred into the RDR register while RDRF=1. An interrupt is generated if RIE=1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No Overrun error 1: Overrun error is detected Note: When this bit is set RDR register content will not be lost but the shift register will be overwritten. Bit 2 = NF Noise flag. This bit is set by hardware when noise is detected on a received frame. It is cleared by a software se- quence (an access to the SCISR register followed by a read to the SCIDR register). 0: No noise is detected 1: Noise is detected Note: This bit does not generate interrupt as it ap- pears at the same time as the RDRF bit which it- self generates an interrupt. Bit 1 = FE Framing error. This bit is set by hardware when a de-synchroniza- tion, excessive noise or a break character is de- tected. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No Framing error is detected 1: Framing error or break character is detected Note: This bit does not generate interrupt as it ap- pears at the same time as the RDRF bit which it- self generates an interrupt. If the word currently being transferred causes both frame error and overrun error, it will be transferred and only the OR bit will be set. Bit 0 = PE Parity error. This bit is set by hardware when a parity error oc- curs in receiver mode. It is cleared by a software sequence (a read to the status register followed by an access to the SCIDR data register). An inter- rupt is generated if PIE=1 in the SCICR1 register. 0: No parity error 1: Parity error 70 TDRE TC RDRF IDLE OR NF FE PE |
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