atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 272
atmega32c1
Manufacturer Part Number
atmega32c1
Description
Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA32C1.pdf
(366 pages)
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22.4
22.5
22.6
22.6.1
23. Boot Loader Support – Read-While-Write Self-Programming
272
ATmega32/64/M1/C1
Software Break Points
Limitations of debugWIRE
debugWIRE Related Register in I/O Memory
ATmega32/64/M1/C1
debugWire Data Register – DWDR
•
•
•
•
debugWIRE supports Program memory Break Points by the AVR Break instruction. Setting a
Break Point in AVR Studio
tion 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 therefore
reduce the Flash Data retention. Devices used for debugging purposes should not be shipped to
end customers.
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.
The following section describes the registers used with the debugWire.
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.
In ATmega32/64/M1/C1, the Boot Loader Support provides a real Read-While-Write Self-Pro-
gramming mechanism for downloading and uploading program code by the MCU itself. This
feature allows flexible application software updates controlled by the MCU using a Flash-resi-
Bit
Read/Write
Initial Value
Pull-up resistors on the dW/(RESET) line must not be smaller than 10kΩ. The pull-up
resistor is not required for debugWIRE functionality.
Connecting the RESET pin directly to V
Capacitors connected to the RESET pin must be disconnected when using debugWire.
All external reset sources must be disconnected.
R/W
7
0
R/W
®
6
0
will insert a BREAK instruction in the Program memory. The instruc-
R/W
5
0
R/W
CC
4
0
DWDR[7:0]
will not work.
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
7647A–AVR–02/08
DWDR
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