AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

Figure 7-2. Clock Distribution AT90PWM2B/3B

PSC0/1/2

General I/O

Modules

ADC

CPU Core

RAM

Flash and

EEPROM

CLKPLL

PLL

PLL Input

Multiplexer

clkI/O

clkADC

AVR Clock

Control Unit

clkCPU

clkFLASH

Reset Logic

Watchdog Timer

Source Clock

Clock

Multiplexer

Watchdog Clock

Watchdog

Oscillator

External Clock

(Crystal

Oscillator)

Calibrated RC

Oscillator

7.1.1

7.1.2

7.1.3

7.1.4

CPU Clock – clkCPU

The CPU clock is routed to parts of the system concerned with operation of the AVR core.

Examples 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

general operations and calculations.

I/O Clock – clkI/O

The I/O clock is used by the majority of the I/O modules, like Timer/Counters, SPI, USART. 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.

Flash Clock – clkFLASH

The Flash clock controls operation of the Flash interface. The Flash clock is usually active simul-

taneously with the CPU clock.

PLL Clock – clkPLL

The PLL clock allows the PSC modules to be clocked directly from a 64/32 MHz clock. A 16 MHz

clock is also derived for the CPU.

30

4317K–AVR–03/2013

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