Synchronous Serial Port (SSI)
Am186™CC/CH/CU Microcontrollers User’s Manual
14-9
■
Only one dedicated SSI enable pin is available. PIOs can be used for additional device
enables if they are required.
■
Software written for the Am186EM SSI that writes to the SSI status register does not
work on the Am186CC/CH/CU microcontrollers.
■
Only the /2 and /4 clock modes are available unless software sets the ENHCTL bit in
the SSSTAT register.
Features added to the SSI are:
■
Programmable data order: Normal (least-significant bit first) or Reverse (most-
significant-bit first)
■
Programmable clock divisor: Divide the clock from 2 to 256 in power of 2 increments
■
Programmable polarity: SCLK and SDEN
14.6
INITIALIZATION
On both external and internal reset, the following occurs:
■
SSSTAT is set to 0000h, which clears status and disables Enhanced Control mode.
■
SSCON is set to 0400h, which sets SCLK to active Low, SDEN to active High, the LSB
transmitted and received first, the clock divisor to 2, and disables SSI operation.
■
The SSTXD0, SSTDX1, and SSRXD registers are set to 0000h, which clears all data.
■
The multiplexed serial pins default to PIO functionality (see Table 14-1 on page 14-2).
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...