ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 351

• Manufacturer Part Number: ATXMEGA256A3B-MH
• Description: MCU AVR 256KB FLASH A3B 64-QFN
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3B-MH

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 49
• Number Of Timers: 7
• Operating Supply Voltage: 1.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• On-chip Dac: 12 bit, 2 Channel
• For Use With: ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATXMEGA256A3B-MU; ATXMEGA256A3B-MU

29.4.4
29.4.4.1
29.4.5
8077H–AVR–12/09
Frame Format and Characters
Serial transmission and reception
Special data characters
The JTAG physical layer supports a fixed frame format. A serial frame is defined to be one char-
acter of eight data bits followed by one parity bit.
Figure 29-10. JTAG serial frame format
Table 29-2.
Three data characters are given a special meaning. Common for all three characters is that the
Parity bit is inverted in order to force parity error upon reception. The BREAK character
(0xBB+P1) is used by the External Programmer to force the PDI to abort any on-going operation
and bring the PDI Controller into a known state. The DELAY Character (0xDB+P1) is used by
the PDI to tell the programmer that it has no data ready programmer that it has no transmission
pending (i.e. the PDI is in RX-mode).
Figure 29-11. Special data characters
The JTAG interface supports full duplex communication. At the same time as input data is
shifted in on the TDI pin, output data is shifted out on the TDO pin. However, PDI communica-
tion relies on half duplex data transfer. Dictated by the PDI Controller, the JTAG physical layer
operates in either Transmit- (TX) or Receive- (RX) mode. The available JTAG bit channel is
used for control and status signalling.
The programmer and the JTAG interface operate synchronously on the TCK clock provided by
the programmer. The dependency between the clock edges and data sampling or data change
is fixed. As illustrated in
the falling edge of TCK, while data always should be sampled on the rising edge of TCK.
(0-7)
P
Data/command bits, least significant bit sent first (0 to 7)
Parity bit, even parity is used
Figure 29-10 on page
1
1
1
0
1
1
1
1 EMPTY CHARACTER (EB+P1)
1 BREAK CHARACTER (BB+P1)
1 DELAY CHARACTER (DB+P1)
1
0
0
0
2
1
1
1
3
351, TDI and TDO is always set up (changed) on
1
1
0
FRAME
4
1
0
1
5
0
1
1
6
1
1
1
7
P1
P1
P1
P
XMEGA A
351