ATA5773-DK1 Atmel, ATA5773-DK1 Datasheet - Page 36

• Manufacturer Part Number: ATA5773-DK1
• Description: BOARD XMITTER FOR ATA5773 315MHZ
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATA5773-DK1

• Frequency: 315MHz
• Maximum Frequency: 315 MHz
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2 V
• Supply Current: 9 mA
• Product: RF Development Tools
• For Use With/related Products: ATA5773
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.9.6
36
Atmel ATA5771/73/74
Calibrated Internal RC Oscillator
By default, the Internal RC Oscillator provides an approximate 8 MHz clock. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the the user. See
Table 8-1 on page 189
details. The device is shipped with the CKDIV8 Fuse programmed. See
Clock Prescaler” on page 38
This clock may be selected as the system clock by programming the CKSEL Fuses as shown
in
loads the pre-programmed calibration value into the OSCCAL Register and thereby automati-
cally calibrates the RC Oscillator. The accuracy of this calibration is shown as Factory
calibration in
By changing the OSCCAL register from SW, see
ister – OSCCAL” on page
the factory calibration. The accuracy of this calibration is shown as User calibration in
8-1 on page
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed
calibration value, see the section
Table 4-8.
Note:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 4-9.
Note:
SUT1..0
Table
10
00
01
11
(1)
4-9..
1. The device is shipped with this option selected.
1. The device is shipped with this option selected.
4-8. If selected, it will operate with no external components. During reset, hardware
189.
Table 8-1 on page
CKSEL3..0
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
0010
from Power-down
(1)
Start-up Time
and
6 CK
6 CK
6 CK
39, it is possible to get a higher calibration accuracy than by using
Section 8.3.8.9 “Internal Oscillator Speed” on page 207
for more details.
189.
Section 4.23.4 “Calibration Byte” on page
Additional Delay from
Reset (V
Reserved
14CK + 64 ms
14CK + 4 ms
Section 4.9.10.1 “Oscillator Calibration Reg-
14CK
CC
Nominal Frequency
= 5.0V)
8.0 MHz
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Section 4.9.9 “System
168.
9137E–RKE–12/10
for more
Table