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AT90SCR100 Datasheet(PDF) 195 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 195 Page - ATMEL Corporation |
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195 / 433 page  195 TPR0327AY–SMS–30Jan09 AT90SCR100 15.7.4 SCIIR - Smart Card UART Interrupt Identification Register • Bit 7 – SCTBI: UART Transmit Buffer Empty Interrupt This bit is set by hardware when the Transmit Buffer is copied into the transmit shift register of the Smart Card UART. It generates an interrupt if ESCTBI bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. • Bit 5..6 – Res: Reserved Bits Those bits arereserved and will always be read as ‘0’. • Bit 4 – VCARDERR: Card Voltage Error Interrupt This bit is set when the output voltage goes out of the voltage range specified by VCARD field. It generates an interrupt if EVCARDER bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. • Bit 3 – SCWTI: Waiting Time Counter Timeout Interrupt This bit is set by hardware when the Waiting Time Counter has expired. It generates an interrupt if ESCWTI bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. • Bit 2 – SCTI: UART Transmitted Character Interrupt This bit is set by hardware when the Smart Card UART has completed the character transmis- sion. It generates an interrupt if ESCTI bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. • Bit 1 – SCRI: UART Received Character Interrupt This bit is set by hardware when the Smart Card UART has completed the character reception. It generates an interrupt if ESCRI bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. • Bit 0 – SCPI: Character Reception Parity Error Interrupt This bit is set at the same time as SCTI or SCRI if a parity error is detected on the received char- acter. It generates an interrupt if ESCPI bit is set in SCIER register otherwise this bit is irrelevant. This bit must be cleared by software. Bit 7 6 5 4 3 2 1 0 $0000FC SCTBI - - VCARDERR SCWTI SCTI SCRI SCPI SCIIR Read/write R R R R R R R R Initial value 0 0 0 0 0 0 0 0 0x00 It is recommended that the application saves the SCIIR register after reading it in order to avoid the loss of pending interruptions as the SCIIR register is cleared when it is read by the MCU. Note |
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