ATxmega128A3 Atmel Corporation, ATxmega128A3 Datasheet - Page 188

• Manufacturer Part Number: ATxmega128A3
• Manufacturer: Atmel Corporation

Specifications of ATxmega128A3

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Speed: No
• Usb Interface: No
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

16. Hi-Res - High Resolution Extension
16.1
16.2
8077H–AVR–12/09
Features
Overview
•
•
•
•
The High-Resolution (Hi-Res) Extension can be used to increase the resolution of the waveform
generation output from a Timer/Counter by four (two bits). It can be used during Frequency and
PWM generation, and also in combination with the corresponding AWeX.
The Hi-Res Extension uses the Peripheral 4x Clock. The System Clock prescalers must be set
up so the Peripheral 4x Clock frequency is four times higher than the Peripheral and CPU clock
frequency (see
Extension is enabled.
Figure 16-1. Timer/Counter operation with Hi-Res Extension enabled
The Hi-Res Extension is implemented by letting the Timer/Counter run at 4x its normal speed.
When Hi-Res Extension is enabled, the counter will ignore its two lowest significant bits (LSB)
and count by four for each Peripheral clock cycle. Overflow/Underflow and Compare match of
the 14 most significant bits (LSB) is done in the Timer/Counter. Count and Compare of the two
LSB is then handled and compared in the Hi-Res Extension running from the Peripheral 4x
clock.
The two LSB of the Period register must always be set to zero to ensure correct operation. If the
Count register is read, the two LSB will always be read as zero since the Timer/Counter run from
the Peripheral clock.
The Hi-Res Extension has narrow pulse deletion preventing output of any pulse shorter than one
Peripheral clock cycle, e.g. a compare value lower than foure will have no visible output.
Increases Waveform Generator Resolution by 4x (2 bits)
Supports Frequency generation, and single and dual-slope PWM operation
Supports Dead-Time Insertion (AWeX)
Supports Pattern Generation (AWeX)
PER[15:2]
CCBUFx[15:0]
”System Clock Selection and Prescalers” on page
CNT[15:2]
CCx[15:2]
=
"match"
BOTTOM
[1:0]
= 0
0
0
2
Generation
Time/Counter
Waveform
=
TOP
2
AWeX
Dead-Time
Insertion
DTI
clk
PER
80) when the Hi-Res
Generation
Protection
Pattern
Fault
XMEGA A
2
clk
HiRes
PER4
Pnx
188