ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 173

• 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

14.12.15 PERL - Period Register L
14.12.16 CCxH - Compare or Capture Register n H
14.12.17 CCxL - Compare or Capture Register n L
14.12.18 PERBUFH - Timer/Counter Period Buffer H
8077H–AVR–12/09
• Bit 7:0 - PER[7:0]
These bits holds the 8 LSB of the 16-bit Period register.
The CCxH and CCxL register pair represents the 16-bit value CCx.
These 16-bit registers have two functions dependent of mode of operation. For capture opera-
tion these registers constitute the second buffer level and access point for the CPU and DMA.
For compare operation these registers are all continuously compared to the counter value. Nor-
mally the outputs form the comparators are then used for generating waveforms.
CCx are updated with the buffer value from the corresponding CCxBUF register when an
UPDATE condition occurs.
• Bit 7:0 - CCx[15:8]
These bits holds the 8 MSB of the 16-bit Compare or Capture register.
• Bit 7:0 - CCx[7:0]
These bits holds the 8 LSB of the 16-bit Compare or Capture register.
The PERBUFH and PERBUFL register pair represents the 16-bit value PERBUF. This 16-bit
register serves as the buffer for the period register (PER). Accessing this register using CPU or
DMA will affect the PERBUFV flag.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
+0x26
Read/Write
Initial Value
R/W
R/W
R/W
7
0
7
1
7
0
R/W
R/W
R/W
6
0
6
1
6
0
R/W
R/W
R/W
5
0
5
1
5
0
R/W
R/W
R/W
4
0
4
1
4
0
CCx[7:0]
CCx[15:8]
PER[7:0]
R/W
R/W
R/W
3
0
3
1
3
0
R/W
R/W
R/W
2
0
2
1
2
0
R/W
R/W
R/W
1
0
1
1
1
0
XMEGA A
R/W
R/W
R/W
0
0
0
1
0
0
CCxH
CCxL
PERL
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