ST10F276E
Serial channels
14
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 Baud rate generators set up all standard Baud rates
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).
14.1
14.2
Asynchronous / synchronous serial interfaces
The asynchronous / synchronous serial interfaces (ASC0 and ASC1) provides serial
communication between the ST10F276E and other microcontrollers, microprocessors or
external peripherals.
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 2M bauds (at 64 MHz of fCPU) is supported in this mode.
Table 52. ASC asynchronous baud rates by reload value and deviation errors (fCPU = 40 MHz)
S0BRS = ‘0’, fCPU = 40 MHz S0BRS = ‘1’, fCPU = 40 MHz
Baud rate
(baud)
Reload value
Baud rate
(baud)
Reload value
Deviation error
Deviation error
(hex)
(hex)
1 250 000
112 000
56 000
38 400
19 200
9 600
4 800
2 400
1 200
600
0.0% / 0.0%
+1.5% / -7.0%
+1.5% / -3.0%
+1.7% / -1.4%
+0.2% / -1.4%
+0.2% / -0.6%
+0.2% / -0.2%
+0.2% / 0.0%
0.1% / 0.0%
0000 / 0000
000A / 000B
0015 / 0016
001F / 0020
0040 / 0041
0081 / 0082
0103 / 0104
0207 / 0208
0410 / 0411
0822 / 0823
1045 / 1046
1FE8 / 1FE9
833 333
112 000
56 000
38 400
19 200
9 600
4 800
2 400
1 200
600
0.0% / 0.0%
+6.3% / -7.0%
+6.3% / -0.8%
+3.3% / -1.4%
+0.9% / -1.4%
+0.9% / -0.2%
+0.4% / -0.2%
+0.1% / -0.2%
+0.1% / -0.1%
+0.1% / 0.0%
0.0% / 0.0%
0000 / 0000
0006 / 0007
000D / 000E
0014 / 0015
002A / 002B
0055 / 0056
00AC / 00AD
015A / 015B
02B5 / 02B6
056B / 056C
0AD8 / 0AD9
1FE8 / 1FE9
0.0% / 0.0%
300
0.0% / 0.0%
0.0% / 0.0%
300
153
102
0.0% / 0.0%
Doc ID 12303 Rev 3
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STMICROELECTRONICS [ ST ]
