Datasheet
157
7701F–AVR–10/12
Atmel ATtiny24/44/84 [Preliminary]
When designing a system where debugWIRE will be used, the following observations must be
made for correct operation:
• Pull-Up resistor on the dW/(RESET) line must be in the range of 10k to 20kΩ. However, the
pull-up resistor is optional.
• Connecting the RESET pin directly to V
CC
will not work.
• Capacitors inserted on the RESET pin must be disconnected when using debugWire.
• All external reset sources must be disconnected.
19.4 Software Break Points
debugWIRE supports program memory break points by the Atmel
®
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
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 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.
19.5 Limitations of debugWIRE
The debugWIRE communication pin (dW) is physically located on the same pin as the 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). See the debugWIRE doc-
umentation for a detailed description of the limitations.
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.
19.6 Register Description
The following section describes the registers used with the debugWire system.
19.6.1 DWDR – debugWire Data Register
The debugWire data register (DWDR) provides a communication channel from the program
running in the MCU to the debugger. This register is only accessible by the debugWIRE sys-
tem, and can, therefore, not be used as a general purpose register in normal operations.
Bit 76543210
0x27 (0x47) DWDR[7:0] DWDR
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0