Rainbow Electronics ATmega8HVD - Manual (Page 120)

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8052B–AVR–09/08
ATmega4HVD/8HVD
• Capacitors connected to the RESET pin must be disconnected when using debugWire.
• All external reset sources must be disconnected.
22.4 Software Break Points
debugWIRE supports Program memory Break Points by the AVR Break instruction. Setting 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 program execution is con-
tinued, 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 automatically
handled by AVR Studio through the debugWIRE interface. The use of Break Points will there-
fore reduce the Flash Data retention. Devices used for debugging purposes should not be
shipped to end customers.
22.5 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.
22.6 Register Description
22.6.1 DWDR – debugWire Data Register
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 7 6 5 4 3 2 1 0
DWDR[7:0] DWDR
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 1 1 1 1 1 1 1 1