ATtiny87-15MZ datasheet(27/282 Pages) ATMEL

27 / 282 page

7728D–AVR–07/09

ATtiny87/ATtiny167

Notes:

1. If 8 MHz frequency exceeds the specification of the device (depends on Vcc), the CKDIV8

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

2. The frequency ranges are guideline values.

3. The device is shipped with this CKSEL = “0010”.

4. Flash Fuse bits.

5. CLKSELR register bits.

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:

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.

4.2.3

128 KHz Internal Oscillator

The 128 KHz internal Oscillator is a low power Oscillator providing a clock of 128 KHz. The

frequency is nominal at 3V and 25°C. This clock may be selected as the system clock by pro-

gramming CKSEL Fuses or CSEL field as shown in Table 4-1 on page 25.

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:

1. Flash Fuse bits

2. CLKSELR register bits

3. This setting is only available if RSTDISBL fuse is not set

Table 4-3.

Internal Calibrated RC Oscillator Operating Modes

(1)

Frequency Range(2) (MHz)

CKSEL3..0

(3)(4)

CSEL3..0

(5)

7.6 - 8.4

0010

Table 4-4.

Start-up Times for the Internal Calibrated RC Oscillator Clock Selection

SUT1..0(1)

CSUT1..0(2)

Start-up Time from

Power-down/save

Additional Delay from

Reset (Vcc = 5.0V)

Recommended Usage

00(3)

6 CK

14CK

BOD enabled

6 CK

14CK + 4.1 ms

Fast rising power

10(4)

6 CK

14CK + 65 ms

Slowly rising power

Reserved

Table 4-5.

Start-up Times for the 128 kHz Internal Oscillator

SUT1..0(1)

CSUT1..0(2)

Start-up Time from

Power-down/save

Additional Delay

from Reset (Vcc = 5.0V)

Recommended Usage

00(3)

6 CK

14CK

BOD enabled

6 CK

14CK + 4.1 ms

Fast rising power

6 CK

14CK + 65 ms

Slowly rising power

Reserved

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