attiny167-esxz ATMEL Corporation, attiny167-esxz Datasheet - Page 26

• Manufacturer Part Number: attiny167-esxz
• Description: 8-bit Avr 8-bit Microcontroller Microcontroller With 16k Bytes In-system Programmable Flash And Lin Controller
• Manufacturer: ATMEL Corporation

4.2.3
4.2.4
26
ATtiny167
128 KHz Internal Oscillator
Crystal Oscillator
When this Oscillator is selected, start-up times are determined by the SUT Fuses or by CSUT
field as shown in
Table 4-4.
Notes:
The 128 KHz internal Oscillator is a low power Oscillator providing a clock of 128 KHz. The fre-
quency is nominal at 3V and 25°C. This clock may be selected as the system clock by
programming CKSEL Fuses or CSEL field as shown in
When this clock source is selected, start-up times are determined by the SUT Fuses or by CSUT
field as shown in
Table 4-5.
Notes:
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con-
figured for use as an On-chip Oscillator, as shown in
ceramic resonator may be used.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in
the manufacturer should be used.
CSUT1..0
CSUT1..0
SUT1..0
SUT1..0
00
00
10
01
10
11
01
11
(3)
5. CLKSELR register bits.
1. Flash Fuse bits
2. CLKSELR register bits
3. This setting is only available if RSTDISBL fuse is not set
4. The device is shipped with this option selected.
1. Flash Fuse bits
2. CLKSELR register bits
3. This setting is only available if RSTDISBL fuse is not set
(3)
(4)
(1)
(1)
(2)
(2)
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Start-up Times for the 128 kHz Internal Oscillator
Table
Table
Start-up Time from
Power-down/save
Start-up Time from
Power-down/save
4-4.
4-5.
6 CK
6 CK
6 CK
6 CK
6 CK
6 CK
Table
4-6. For ceramic resonators, the capacitor values given by
from Reset (Vcc = 5.0V)
Additional Delay from
Additional Delay
14CK + 4.1 ms
Reset (Vcc = 5.0V)
14CK + 65 ms
14CK + 4.1 ms
14CK + 65 ms
Reserved
14CK
Reserved
14CK
Table 4-1 on page
Figure
4-2. Either a quartz crystal or a
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
24.
7728A–AUTO–07/08