ATtiny13A datasheet(26/174 Pages) ATMEL

26 / 174 page

8126D–AVR–11/09

ATtiny13A

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

Table 6-5.

Notes: 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

ensure programming mode can be entered.

6.2.3

Internal 128 kHz Oscillator

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 select

as the system clock by programming the CKSEL fuses to “11”.

When this clock source is selected, start-up times are determined by the SUT fuses as shown in

Table 6-6.

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.

6.2.4

Default Clock Source

The device is shipped with CKSEL = “10”, SUT = “10”, and CKDIV8 programmed. The default

clock source setting is therefore the Internal RC Oscillator running at 9.6 MHz with longest start-

up time and an initial system clock prescaling of 8. This default setting ensures that all users can

make their desired clock source setting using an In-System or High-voltage Programmer.

6.3

System Clock Prescaler

The ATtiny13A system clock can be divided by setting the “CLKPR – Clock Prescale Register”

on page 28. This feature can be used to decrease power consumption when the requirement for

processing power is low. This can be used with all clock source options, and it will affect the

clock frequency of the CPU and all synchronous peripherals. clkI/O, clkADC, clkCPU, and clkFLASH

are divided by a factor as shown in Table 6-8 on page 28.

Table 6-5.

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

SUT1..0

Start-up Time

from Power-down

Additional Delay from

Reset (VCC = 5.0V)

Recommended Usage

6 CK

14CK(2)

BOD enabled

6 CK

14CK + 4 ms

Fast rising power

10(1)

6 CK

14CK + 64 ms

Slowly rising power

Reserved

Table 6-6.

Start-up Times for the 128 kHz Internal Oscillator

SUT1:0

Start-up Time from

Power-down and Power-save

Additional Delay

from Reset

Recommended

Usage

6 CK

14CK(1)

BOD enabled

6 CK

14CK + 4 ms

Fast rising power

6 CK

14CK + 64 ms

Slowly rising power

Reserved

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