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型號(hào)：	SC-80C32E-30/883
廠商：	ATMEL CORP
元件分類(lèi)：	微控制器/微處理器
英文描述：	8-BIT, 30 MHz, MICROCONTROLLER, CDIP40
封裝：	SIDE BRAZED, DIP-40
文件頁(yè)數(shù)：	949/1021頁(yè)
文件大?。?/td>	15196K
代理商：	SC-80C32E-30/883

32072H–AVR32–10/2012

AT32UC3A3

The trace features can be configured to be very selective, to reduce the bandwidth on the AUX

port. In case the transmit queue overflows, error messages are produced to indicate loss of

data. The transmit queue module can optionally be configured to halt the CPU when an overflow

occurs, to prevent the loss of messages, at the expense of longer run-time for the program.

program trace

Program trace allows the debugger to continuously monitor the program execution in the CPU.

Program trace messages are generated for every branch in the program, and contains com-

pressed information, which allows the debugger to correlate the message with the source code

to identify the branch instruction and target address.

Data trace outputs a message every time a specific location is read or written. The message

contains information about the type (read/write) and size of the access, as well as the address

and data of the accessed location. The AT32UC3A3 contains two data trace channels, each of

which are controlled by a pair of OCD registers which determine the range of addresses (or sin-

gle address) which should produce data trace messages.

ownership trace

Program and data trace operate on virtual addresses. In cases where an operating system runs

several processes in overlapping virtual memory segments, the Ownership Trace feature can be

used to identify the process switch. When the O/S activates a process, it will write the process ID

number to an OCD register, which produces an Ownership Trace Message, allowing the debug-

ger to switch context for the subsequent program and data trace messages. As the use of this

feature depends on the software running on the CPU, it can also be used to extract other types

of information from the system.

watchpoint messages

The breakpoint modules normally used to generate program and data breakpoints can also be

used to generate Watchpoint messages, allowing a debugger to monitor program and data

events without halting the CPU. Watchpoints can be enabled independently of breakpoints, so a

breakpoint module can optionally halt the CPU when the trigger condition occurs. Data trace

modules can also be configured to produce watchpoint messages instead of regular data trace

Event In and Event Out pins

The AUX port also contains an Event In pin (EVTI_N) and an Event Out pin (EVTO_N). EVTI_N

can be used to trigger a breakpoint when an external event occurs. It can also be used to trigger

specific program and data trace synchronization messages, allowing an external event to be

correlated to the program flow.

When the CPU enters debug mode, a Debug Status message is transmitted on the trace port.

All trace messages can be timestamped when they are received by the debug tool. However,

due to the latency of the transmit queue buffering, the timestamp will not be 100% accurate. To

improve this, EVTO_N can toggle every time a message is inserted into the transmit queue,

allowing trace messages to be timestamped precisely. EVTO_N can also toggle when a break-

point module triggers, or when the CPU enters debug mode, for any reason. This can be used to

measure precisely when the respective internal event occurs.

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