ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 48

• Manufacturer Part Number: ATA6616-P3PW
• Description: TXRX MULTICHIP MOD LIN SIP 38QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6616-P3PW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.5
4.5.1
48
System Clock and Clock Options
Atmel ATA6616/ATA6617
Clock Systems and their Distribution
The Atmel
two categories: internal and external. Some external clock sources can be shared with the
asynchronous timer. After reset, the clock source is determined by the CKSEL Fuses. Once
the device is running, software clock switching is possible to any other clock sources.
Hardware controls are provided for clock switching management but some specific proce-
dures must be observed. Clock switching should be performed with caution as some settings
could result in the device having an incorrect configuration.
Figure 4-10
clocks may not need to be active at any given time. In order to reduce power consumption, the
clocks to modules not being used can be halted by using different sleep modes or by using
features of the dynamic clock switch circuit (See
Modes” on page 65
below.
Figure 4-10. Clock Distribution
Timer/Counter0
Asynchronous
®
CKOUT
ATtiny87/167 provides a large number of clock sources. They can be divided into
presents the principal clock systems in the AVR
Fuse
General I/O
External Clock
and
Modules
clk
clk
“Dynamic Clock Switch” on page
ASY
I/O
PB4 / XTAL1 / CLKI
Multiplexer
Crystal Oscillator
Control Unit
Low-frequency
AVR Clock
ADC
clk
Source Clock
Clock Switch
ADC
Prescaler
PB5 / XTAL2 / CLKO
Section 4.6 “Power Management and Sleep
Reset Logic
CPU Core
clk
clk
CPU
FLASH
Oscillator
Crystal
55). The clock systems are detailed
Watchdog Clock
®
Watchdog
Oscillator
and their distribution. All of the
Watchdog Timer
RAM
9132D–AUTO–12/10
Calibrated RC
Flash and
EEPROM
Oscillator