Asynchronous Serial Ports (UARTs)
Am186™CC/CH/CU Microcontrollers User’s Manual
13-23
13.5.12
Comparison to Other Devices
The UARTs are similar to those of the other Am186 family microcontrollers and are most
closely related to those of the Am186ES and Am186ED microcontrollers. However, the
functionality provided by the serial port modes of those devices have been replaced by
individual enables that allow for more flexibility on the UARTs and the configuration of the
DMA interface has been modified. In addition, both the UART and the High-Speed UART
of the microcontroller provide significant enhancements over previous UARTs, including
extended reads and writes, support for address bits on 7-data bit frames, and two stop bits.
The High-Speed UART’s enhancements additionally include autobaud detection, receive
and transmit FIFOs, and special character matching.
13.6
INITIALIZATION
On both external and internal reset, the following occurs:
■
All register bits are cleared to 0 except for the following second-level interrupt enable
bits in the (H)SPIMSK registers: BRK, RDR, THRE, FER, OER and PER. This provides
compatibility with the Am186ES and Am186ED microcontroller serial ports.
■
All UART and High-Speed UART signals, except for TXD_HU, default to that signal’s
PIO function. See Table 13-1 on page 13-3.
■
The ITF4 bit field in the SYSCON register is cleared, which defaults external interface
D to HDLC with flow control.
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...