ata6616 ATMEL Corporation, ata6616 Datasheet - Page 57

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

4.5.3.2
9132A–AUTO–10/08
DRAFT
CLKSELR Register
Fuses Substitution
At reset, bits of the Low Fuse Byte are copied into the CLKSELR register. The content of this
register can subsequently be user modified to overwrite the default values from the Low Fuse
Byte. CKSEL3..0, SUT1..0 and CKOUT fuses correspond respectively to CSEL3..0, CSUT1:0
and ~(COUT) bits of the CLKSELR register as shown in
Source Selection
The available codes of clock source are given in
Figure 4-14. Fuses Substitution and Clock Source Selection
The CLKSELR register contains the CSEL, CSUT and COUT values which will be used by the
‘Enable/Disable Clock Source’, ‘Request for Clock Availability’ or ‘Clock Source Switching’
commands.
Source Recovering
The ‘Recover System Clock Source’ command updates the CKSEL field of CLKSELR register
(See “System Clock Source Recovering” on page
• Command status return. The ‘Request Clock Availability’ command returns status via the
CLKRDY bit in the CLKCSR register. The ‘Recover System Clock Source’ command returns
a code of the current clock source in the CLKSELR register. This information is used in the
supervisory software routines as shown in
Fuse Low Byte
SCLKRq
Fuse:
(
*
)
: Command of Clock Control & Status Register
SCLKRq
Reset
(
*
)
CLKSELR
Register:
ATA6616/ATA6617 [Preliminary]
Section 4.5.3.7 on page
CKSEL[3..0]
SUT[1..0]
Table 4-4 on page
58.).
Figure 4-14 on page
SEL-0
SEL-1
SEL-2
SEL-n
CKOUT
EN-0
EN-1
EN-2
EN-n
50.
58.
57.
Configuration
Configuration
Selected
Current
Switch
Clock
57