ATtiny88 datasheet(28/266 Pages) ATMEL

28 / 266 page

8008C–AVR–03/09

ATtiny48/88

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 “Calibration Byte” on page 186.

Notes:

1. The device is shipped with this option selected.

2. The frequency ranges are preliminary values. Actual values are TBD.

3. If 8 MHz frequency exceeds the specification of the device (depends on V

CC), the CKDIV8

Fuse can be programmed in order to divide the internal frequency by 8.

When this oscillator is selected, start-up times are determined by the SUT Fuses as shown in

the table below.

Note:

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.

The device is shipped with this option selected.

6.4

128 kHz Internal Oscillator

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 select as the system clock by

programming the CKSEL Fuses to “11” as shown in Table 6-5.

Note:

1. The frequency is preliminary value. Actual value is TBD.

Table 6-3.

Selecting Internal Calibrated Oscillator Mode

(1)(3)

CKSEL1..0

Frequency Range(2) (MHz)

7.3

– 8.1

Table 6-4.

Start-up Times for the Internal Calibrated Oscillator Clock Selection

SUT1..0

Power Conditions

Start-up Time

from Power-down

Additional Delay

from Reset (V

CC = 5.0V)

BOD enabled

6 CK

14CK(1)

Fast rising power

6 CK

14CK + 4 ms

Slowly rising power

6 CK

14CK + 64 ms(2)

Reserved

Table 6-5.

Selecting 128 kHz Internal Oscillator Modes

CKSEL1..0

Nominal Frequency

128 kHz

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