ATTINY13-12SJ 查看數據表（PDF） - Atmel Corporation

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ATTINY13-12SJ

8-bit Microcontroller with 1K Bytes In-System Programmable Flash

Atmel Corporation 

ATtiny13

Clock Sources

Default Clock Source

The device has the following clock source options, selectable by Flash Fuse bits as

shown below. The clock from the selected source is input to the AVR clock generator,

and routed to the appropriate modules.

Table 2. Device Clocking Options Select(1)

Device Clocking Option

CKSEL1..0

Calibrated Internal RC Oscillator

01, 10

External Clock

00

128 kHz Internal Oscillator

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Note: 1. For all fuses “1” means unprogrammed while “0” means programmed.

The various choices for each clocking option is given in the following sections. When the

CPU wakes up from Power-down or Power-save, the selected clock source is used to

time the start-up, ensuring stable Oscillator operation before instruction execution starts.

When the CPU starts from reset, there is an additional delay allowing the power to reach

a stable level before commencing normal operation. The Watchdog Oscillator is used

for timing this real-time part of the start-up time. The number of WDT Oscillator cycles

used for each time-out is shown in Table 3.

Table 3. Number of Watchdog Oscillator Cycles

Typ Time-out

4 ms

64 ms

Number of Cycles

512

8K (8,192)

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.

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2535B–AVR–01/04

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