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C511 Datasheet(PDF) 86 Page - Siemens Semiconductor Group |
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C511 Datasheet(HTML) 86 Page - Siemens Semiconductor Group |
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86 / 128 page  On-Chip Peripheral Units Semiconductor Group 6-53 6.4.8.4 Data Registers STB and SRB The register STB holds the data to be transmitted while SRB contains the data which was received during the last transfer. A write to the STB places the data directly into the shift register for transmission. Only in master mode this also will initiate the transmission/reception process. When a write collision occurs STB will hold the value written erroneously. This value can be read by reading from STB. A read from the receive buffer register SRB will transfer the data of the last transfer completed. This register must be read before the next transmission completes or the data will be lost. There is no indication for this overrun condition. After reset the contents of the shift register and the receive buffer register are undefined. 6.4.8.5 Mode Test Register SSCMOD The register SSCMOD is used to enable test modes during factory test. It must not be written or modified during normal operation of the SAB-C511/513. Special Function Registers SSCMOD (Address EBH) Reset Value : 00H Bit Function 7-0 All bits of this register are set to 0 after reset and must not be modified ! 0 000 EBH SSCMOD Bit No. 7 65 43 21 0 MSB LSB 0 000 |
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