ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 170

• 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

14.12.9
8077H–AVR–12/09
CTRLGCLR/CTRLGSET - Control Register G Clear/Set
• Bit 3:2 - CMD[1:0]: Timer/Counter Command
These command bits can be used for software control of update, restart, and reset of the
Timer/Counter. The command bits are always read as zero.
Table 14-7.
• Bit 1 - LUPD: Lock Update:
When this bit is set no update of the buffered registers is performed, even though an UPDATE
condition has occurred. Locking the update ensures that all buffers, including DTI buffers, are
valid before an update is performed.
This bit has no effect when input capture operation is enabled.
• Bit 0 - DIR: Counter Direction:
When zero, this bit indicates that the counter is counting up (incrementing). A one indicates that
the counter is in down counting (decrementing) state.
Normally this bit is controlled in hardware by the waveform generation mode, or by event
actions, but this bit can also be changed from software.
Refer to section
mation on how to access this type of status register.
• Bit 7:5 - Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 4:1 - CCxBV: Compare or Capture x Buffer Valid
These bits are set when a new value is written to the corresponding CCxBUF register. These
bits are automatically cleared on an UPDATE condition.
Note that when input capture operation is used, this bit is set on capture event and cleared if the
corresponding CCxIF is cleared.
• Bit 0 - PERBV: Period Buffer Valid
This bit is set when a new value is written to the PERBUF register. This bit is automatically
cleared on an UPDATE condition.
Bit
+0x0A/ +0x0B
Read/Write
Initial Value
CMD
00
01
10
11
Command selections
7
R
0
-
”CTRLFCLR/CTRLFSET - Control Register F Clear/Set” on page 169
Group Configuration
RESTART
R
6
0
-
UPDATE
RESET
NONE
R
5
0
-
CCDBV
R/W
4
0
Command Action
None
Force Update
Force Restart
Force Hard Reset (Ignored if T/C is not in “OFF“state)
CCCBV
R/W
3
0
CCBBV
R/W
2
0
CCABV
R/W
1
0
PERBV
R/W
XMEGA A
0
0
CTRLGCLR/SET
for infor-
170