ATTINY84-15MZ Atmel, ATTINY84-15MZ Datasheet - Page 156

• Manufacturer Part Number: ATTINY84-15MZ
• Description: MCU AVR 8K FLASH 15MHZ 20-QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY84-15MZ

• Package / Case: 20-QFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 12
• Eeprom Size: 512 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Program Memory Size: 8KB (8K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Processor Series: ATTINY8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19.4
19.5
19.6
19.6.1
156
Software Break Points
Limitations of debugWIRE
Register Description
Atmel ATtiny24/44/84 [Preliminary]
DWDR – debugWire Data Register
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 20k . However, the
• Connecting the RESET pin directly to V
• Capacitors inserted on the RESET pin must be disconnected when using debugWire.
• All external reset sources must be disconnected.
debugWIRE supports program memory break points by the Atmel
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.
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.
The following section describes the registers used with the debugWire system.
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
0x27 (0x47)
Read/Write
Initial Value
pull-up resistor is optional.
R/W
7
0
R/W
6
0
R/W
5
0
CC
R/W
4
0
will not work.
DWDR[7:0]
R/W
3
0
R/W
2
0
®
AVR
R/W
1
0
®
BREAK instruction.
R/W
0
0
7701D–AVR–09/10
DWDR