AT90PWM2 datasheet(272/365 Pages) ATMEL

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272

AT90PWM2/3

4317B–AVR–02/05

•

Capacitors connected to the RESET pin must be disconnected when using

debugWire.

•

All external reset sources must be disconnected.

Software Break Points

debugWIRE supports Program memory Break Points by the AVR Break instruction. Set-

ting a Break Point in AVR Studio

® will insert a BREAK instruction in the Program

memory. The instruction replaced by the BREAK instruction will be stored. When pro-

gram execution is continued, the stored instruction will be executed before continuing

from the Program memory. A break can be inserted manually by putting the BREAK

instruction in the program.

The Flash must be re-programmed each time a Break Point is changed. This is auto-

matically handled by AVR Studio through the debugWIRE interface. The use of Break

Points will therefore reduce the Flash Data retention. Devices used for debugging pur-

poses should not be shipped to end customers.

Limitations of

debugWIRE

The debugWIRE communication pin (dW) is physically located on the same pin as

External Reset (RESET). An External Reset source is therefore not supported when the

debugWIRE is enabled.

The debugWIRE system accurately emulates all I/O functions when running at full

speed, i.e., when the program in the CPU is running. When the CPU is stopped, care

must be taken while accessing some of the I/O Registers via the debugger (AVR

Studio).

A programmed DWEN Fuse enables some parts of the clock system to be running in all

sleep modes. This will increase the power consumption while in sleep. Thus, the DWEN

Fuse should be disabled when debugWire is not used.

debugWIRE Related

The following section describes the registers used with the debugWire.

debugWire Data Register –

DWDR

The DWDR Register provides a communication channel from the running program in

the MCU to the debugger. This register is only accessible by the debugWIRE and can

therefore not be used as a general purpose register in the normal operations.

Bit

765

432

DWDR[7:0]

DWDR

Read/Write

R/W

Initial Value

AT90PWM2 Datasheet(PDF) 272 Page - ATMEL Corporation

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