Am186™CC/CH/CU Microcontrollers User’s Manual
14-1
CHAPTER
14
SYNCHRONOUS
SERIAL PORT (SSI)
14.1
OVERVIEW
The Am186CC/CH/CU microcontrollers each include one synchronous serial port, which
uses the SSI to provide a half-duplex, bidirectional communications interface between the
microcontroller and other system components (i.e., integrated circuits). This interface is
typically used by the microcontroller to monitor the status of other system devices or to
configure these devices under software control. In a communications application, these
devices could be system components such as transceivers or audio coder-decoders
(codecs). The SSI supports data transfer speeds of up to 25 Mbit/s.
The SSI provides the following features:
■
Three I/O signals: SCLK, SDATA, and SDEN, multiplexed with PIOs
■
Programmable data order: Normal (least-significant bit first) or Reverse (most-
significant-bit first)
■
Programmable SSI clock divisor: Divides the CPU clock from 2 to 256 in power of 2
increments
■
Programmable polarity of the SCLK and SDEN signals
■
Bidirectional transmit/receive shift register
14.2
BLOCK DIAGRAM
Figure 14-1 shows the block diagram for the SSI.
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...