MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
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Freescale Semiconductor, I
16.2 Introduction
16.12 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
16.12.1 Frame Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
16.12.2 Receiving a Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356
16.12.3 Data Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
16.12.4 Framing Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .362
16.12.5 Baud Rate Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .362
16.12.5.1 Slow Data Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . .363
16.12.5.2 Fast Data Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . .364
16.12.6 Receiver Wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .365
16.12.6.1 Idle Input Line Wakeup (WAKE = 0) . . . . . . . . . . . . . . .365
16.12.6.2 Address Mark Wakeup (WAKE = 1). . . . . . . . . . . . . . . .365
16.13 Single-Wire Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .366
16.14 Loop Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .367
16.15 I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .368
16.16 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .369
16.17 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .369
16.17.1 Transmit Data Register Empty . . . . . . . . . . . . . . . . . . . . . .369
16.17.2 Transmission Complete . . . . . . . . . . . . . . . . . . . . . . . . . . .369
16.17.3 Receive Data Register Full. . . . . . . . . . . . . . . . . . . . . . . . .370
16.17.4 Idle Receiver Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .370
16.17.5 Overrun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .370
The serial communications interface (SCI) allows asynchronous serial
communications with peripheral devices and other microcontroller units
(MCU).
The MMC2107 has two identical SCI modules, each with its own control
registers and input/output (I/O) pins.
In the text that follows, SCI register names are denoted generically.
Thus, SCIPORT refers interchangeably to SCI1PORT and SCI2PORT,
the port data registers for SCI1 and SCI2, respectively.
Technical Data MMC2107 – Rev. 2.0
330 Serial Communications Interface Modules (SCI1 and SCI2) MOTOROLA
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