Datasheet

646
32133D–11/2011
UC3D
30. aWire UART (AW)
Rev: 2.3.0.0
30.1 Features
• Asynchronous receiver or transmitter when the aWire system is not used for debugging.
• One- or two-pin operation supported.
30.2 Overview
If the AW is not used for debugging, the aWire UART can be used by the user to send or receive
data with one start bit, eight data bits, no parity bits, and one stop bit. This can be controlled
through the aWire UART user interface.
This chapter only describes the aWire UART user interface. For a description of the aWire
Debug Interface, please see the Programming and Debugging chapter.
30.3 Block Diagram
Figure 30-1. aWire Debug Interface Block Diagram
UART
Reset
filter
External reset
AW_ENABLE
RESET_N
Baudrate Detector
RW SZ ADDR DATA
CRC
AW CONTROL
AW User Interface
SAB interface
RESET command
Power
Manager
CPU
HALT command
Flash
Controller
CHIP_ERASE command
aWire Debug Interface
PB
SAB