ata5773 ATMEL Corporation, ata5773 Datasheet - Page 78

• Manufacturer Part Number: ata5773
• Description: Microcontroller With Uhf Ask/fsk Transmitter
• Manufacturer: ATMEL Corporation

6.2.3
26
ATtiny24/44/84
Internal 128 kHz Oscillator
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 cali-
bration value, see the section
Table 6-4.
Note:
When this oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 6-5.
Note:
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency depends on supply voltage, temperature and batch variations. This clock may be
selected as the system clock by programming the CKSEL Fuses to “0100”.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 6-6.
Note:
SUT1..0
SUT1..0
10
00
01
11
00
01
10
11
(1)
6-5..
6-6.
1. The device is shipped with this option selected.
1. The device is shipped with this option selected.
2. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
ensure programming mode can be entered.
ensure programming mode can be entered.
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Start-up Times for the 128 kHz Internal Oscillator
from Power-down
from Power-down
CKSEL3..0
Start-up Time
0010
Start-up Time
6 CK
6 CK
6 CK
6 CK
6 CK
6 CK
(1)
“Calibration Byte” on page
Additional Delay from
Reset (V
Additional Delay
Reserved
Reserved
14CK + 64 ms
14CK + 64 ms
14CK + 4 ms
14CK + 4 ms
from Reset
14CK
14CK
CC
162.
(2)
(1)
= 5.0V)
Nominal Frequency
8.0 MHz
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Recommended
Usage
8006G–AVR–01/08