ata6616 ATMEL Corporation, ata6616 Datasheet - Page 49

• Manufacturer Part Number: ata6616
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

4.5.1.1
4.5.1.2
4.5.1.3
9132A–AUTO–10/08
DRAFT
CPU Clock – clk
I/O Clock – clk
Flash Clock – clk
Figure 4-10. Clock Distribution
The CPU clock is routed to parts of the system concerned with the AVR core operation. Exam-
ples of such modules are the General Purpose Register File, the Status Register and the Data
memory holding the Stack Pointer. Halting the CPU clock inhibits the core from performing gen-
eral operations and calculations.
The I/O clock is used by the majority of the I/O modules, like synchronous Timer/Counter. The
I/O clock is also used by the External Interrupt module, but note that some external interrupts
are detected by asynchronous logic, allowing such interrupts to be detected even if the I/O clock
is halted.
The Flash clock controls operation of the Flash interface. The Flash clock is usually active simul-
taneously with the CPU clock.
I/O
Timer/Counter0
CPU
Asynchronous
FLASH
CKOUT
Fuse
General I/O
External Clock
Modules
clk
clk
ASY
I/O
PB4 / XTAL1 / CLKI
Multiplexer
ATA6616/ATA6617 [Preliminary]
Crystal Oscillator
Control Unit
Low-frequency
AVR Clock
ADC
clk
Source Clock
Clock Switch
ADC
Prescaler
PB5 / XTAL2 / CLKO
Reset Logic
CPU Core
clk
clk
CPU
FLASH
Oscillator
Crystal
Watchdog Clock
Watchdog
Oscillator
Watchdog Timer
RAM
Calibrated RC
Flash and
EEPROM
Oscillator
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