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ST10F272M Datasheet(PDF) 68 Page - STMicroelectronics |
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ST10F272M Datasheet(HTML) 68 Page - STMicroelectronics |
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68 / 175 page  Serial channels ST10F272M 68/176 15 Serial channels Serial communication with other microcontrollers, microprocessors, terminals or external peripheral components is provided by up to four serial interfaces: two asynchronous / synchronous serial channels (ASC0 and ASC1) and two high-speed synchronous serial channel (SSC0 and SSC1). Dedicated baudrate generators set up all standard baudrates without the requirement of oscillator tuning. For transmission, reception and erroneous reception, separate interrupt vectors are provided for ASC0 and SSC0 serial channel. A more complex mechanism of interrupt sources multiplexing is implemented for ASC1 and SSC1 (XBUS mapped). 15.1 Asynchronous / synchronous serial interfaces The asynchronous / synchronous serial interfaces (ASC0 and ASC1) provides serial communication between the ST10F272M and other microcontrollers, microprocessors or external peripherals. 15.2 ASCx in asynchronous mode In asynchronous mode, 8- or 9-bit data transfer, parity generation and the number of stop bits can be selected. Parity framing and overrun error detection is provided to increase the reliability of data transfers. Transmission and reception of data is double-buffered. Full- duplex communication up to 1.25 Mbaud (at 40 MHz of fCPU) is supported in this mode. Note: The deviation errors given in the Table 37 are rounded off. To avoid deviation errors use a baudrate crystal (providing a multiple of the ASC0 sampling frequency). Table 37. ASC asynchronous baudrates by reload value and deviation errors (fCPU = 40 MHz) S0BRS = ‘0’, fCPU = 40 MHz S0BRS = ‘1’, fCPU = 40 MHz Baudrate (baud) Deviation error Reload value (hex) Baudrate (baud) Deviation error Reload value (hex) 1 250 000 0.0% / 0.0% 0000 / 0000 833 333 0.0% / 0.0% 0000 / 0000 112 000 +1.5% / -7.0% 000A / 000B 112 000 +6.3% / -7.0% 0006 / 0007 56 000 +1.5% / -3.0% 0015 / 0016 56 000 +6.3% / -0.8% 000D / 000E 38 400 +1.7% / -1.4% 001F / 0020 38 400 +3.3% / -1.4% 0014 / 0015 19 200 +0.2% / -1.4% 0040 / 0041 19 200 +0.9% / -1.4% 002A / 002B 9 600 +0.2% / -0.6% 0081 / 0082 9 600 +0.9% / -0.2% 0055 / 0056 4 800 +0.2% / -0.2% 0103 / 0104 4 800 +0.4% / -0.2% 00AC / 00AD 2 400 +0.2% / 0.0% 0207 / 0208 2 400 +0.1% / -0.2% 015A / 015B 1 200 0.1% / 0.0% 0410 / 0411 1 200 +0.1% / -0.1% 02B5 / 02B6 600 0.0% / 0.0% 0822 / 0823 600 +0.1% / 0.0% 056B / 056C 300 0.0% / 0.0% 1045 / 1046 300 0.0% / 0.0% 0AD8 / 0AD9 153 0.0% / 0.0% 1FE8 / 1FE9 102 0.0% / 0.0% 1FE8 / 1FE9 |
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