Am186™CC/CH/CU Microcontrollers User’s Manual
12-1
CHAPTER
12
SERIAL COMMUNICATIONS
OVERVIEW
12.1
OVERVIEW
The Am186CC/CH/CU microcontrollers support both asynchronous and synchronous
serial communications. These features are described in the chapters indicated in the bullets
below. The remainder of this chapter shows some of the trade-offs of using the various
serial communications features available on the microcontroller and provides a brief
overview of serial communications.
■
Two asynchronous serial ports, the Universal Asynchronous Receiver/Transmitter
(UART) and High-Speed UART, provide full-duplex, bidirectional data transfer in RS-232
format using several industry-standard protocols: CTS/RTR and 9-Data-Bit (multidrop).
The UART supports data transfer speeds of up to 115.2 Kbaud; the High-Speed UART
supports speeds up to 460 Kbaud. See Chapter 13, “Asynchronous Serial Ports
(UARTs).”
■
One synchronous serial port provides half-duplex, bidirectional data transfer using the
Synchronous Serial Interface (SSI). The microcontroller can operate as the master for
multiple slave peripheral devices. The SSI supports data transfer speeds of up to
25 Mbit/s with a 50-MHz CPU clock. See Chapter 14, “Synchronous Serial Port (SSI).”
■
Four High-level Data Link Control (HDLC) channels on the Am186CC and Am186CH
microcontrollers provide 8-bit element (byte or character) or frame full-duplex
synchronous serial data transmission. The clock is provided by the Time Slot Assigner
(TSA) for that channel. For the most part, the TSA muxing logic controls the path data
takes from an HDLC to an external communication interface (or vice versa). External
interfaces supported are: raw Data Communications Equipment (DCE), Pulse Code
Modulation (PCM) Highway, and on the Am186CC microcontroller only, General Circuit
Interface (GCI). Each TSA channel can support a burst data rate to or from an HDLC
channel of up to 10 Mbit/s in both raw DCE and PCM highway modes, and up to 768
Kbit/s in GCI mode. See Chapter 15, “High-Level Data Link Control (HDLC),” Chapter 16,
“HDLC External Serial Interface Configuration (TSAs),” and Chapter 17, “General Circuit
Interface (GCI).”
■
The Am186CC and Am186CU microcontrollers both provide a Universal Serial Bus
(USB) peripheral controller, which supports full-speed (12 Mbit/s) USB bulk,
isochronous, interrupt, and control transfers as defined in the
Universal Serial Bus
Specification, Revision 1.0. The microcontroller acts as a USB peripheral device. The
USB is a half-duplex, master/slave, polled bus. In other words, the microcontroller only
transmits on the USB in response to a request from the USB host, usually a personal
computer. There can be only one transmitter on the USB at a time. See Chapter 18,
“Universal Serial Bus (USB).”
CH
CC
CU
CC
Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Страница 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Страница 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Страница 39: ...Architectural Overview Am186 CC CH CU Microcontrollers User s Manual 1 15 Figure 1 6 32 Channel Linecard CH CC...
Страница 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Страница 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Страница 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Страница 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Страница 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...