AT32UC3L064-D3HES ATMEL [ATMEL Corporation], AT32UC3L064-D3HES Datasheet - Page 318
AT32UC3L064-D3HES
Manufacturer Part Number
AT32UC3L064-D3HES
Description
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT32UC3L064-D3HES.pdf
(830 pages)
- Current page: 318 of 830
- Download datasheet (11Mb)
18.4.2
18.4.3
18.4.4
18.5
18.5.1
32099D–06/2010
Functional Description
Clocks
Debug Operation
Interrupts
Reference Clock
The clock for the FREQM bus interface (CLK_FREQM) is generated by the Power Manager.
This clock is enabled at reset, and can be disabled in the Power Manager. It is recommended to
disable the FREQM before disabling the clock, to avoid freezing the FREQM ia an undefined
state.
A set of clocks can be selected as reference (CLK_REF) and another set of clocks can be
selected for measurement (CLK_MSR). Please refer to the CLKSEL and REFSEL tables in the
Module Configuration section for details.
When an external debugger forces the CPU into debug mode, the FREQM continues normal
operation. If the FREQM is configured in a way that requires it to be periodically serviced by the
CPU through interrupts or similar, improper operation or data loss may result during debugging.
The FREQM interrupt request line is connected to the internal source of the interrupt controller.
Using the FREQM interrupt requires the interrupt controller to be programmed first.
The FREQM accuratly measures the frequency of a clock by comparing the frequency to a
known frequency:
The Reference Clock Selection (REFSEL) field in the Mode Register (MODE) selects the clock
source for CLK_REF. The reference clock is enabled by writing a one to the Reference Clock
Enable (REFCEN) bit in the Mode Register. This clock should have a known frequency.
CLK_REF needs to be disabled before switching to another clock. The RCLKBUSY bit in the
Status Register (SR) indicates whether the clock is busy or not. This bit is set when the
MODE.REFCEN bit is written.
To change CLK_REF:
To enable CLK_REF:
To disable CLK_REF:
• Write a zero to the MODE.REFCEN bit to disable the clock, without changing the other
• Wait until the SR.RCLKBUSY bit reads as zero.
• Change the MODE.REFSEL field.
• Write a one to the MODE.REFCEN bit to enable the clock, without changing the other
• Wait until the SR.RCLKBUSY bit reads as zero.
• Write the correct value to the MODE.REFSEL field.
• Write a one to the MODE.REFCEN to enable the clock, without changing the other bits/fields
• Wait until the SR.RCLKBUSY bit reads as zero.
bits/fields in the Mode Register.
bits/fields in the Mode Register.
in the Mode Register.
f
CLK_MSR
= (VALUE/REFNUM)*f
CLK_REF
AT32UC3L016/32/64
318
Related parts for AT32UC3L064-D3HES
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64K Bytes In-System Programmable Programmable
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: