ATA8742-PXQW【PDF 182/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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182

9151AINDCO07/09

ATA8742

Notes: 1. See System Clock Prescaler on page 47 for details.

2. The default value of SUT1..0 results in maximum start-up time for the default clock source.

See Table 14-7 on page 45 for details.

3. The default setting of CKSEL3..0 results in internal RC Oscillator @ 8.0 MHz. See Table 14-6

on page 45 for details.

The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if

Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the Lock bits.

28.2.1

Latching of Fuses

The fuse values are latched when the device enters programming mode and changes of the

fuse values will have no effect until the part leaves Programming mode. This does not apply to

the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on

Power-up in Normal mode.

28.3 Signature Bytes

All Atmel microcontrollers have a three-byte signature code which identifies the device. This

code can be read in both serial and High-voltage Programming mode, also when the device is

locked. The three bytes reside in a separate address space. For the ATtiny24/44/84 the signa-

ture bytes are given in Table 28-6.

28.4 Calibration Byte

Signature area of the ATtiny24/44/84 has one byte of calibration data for the internal RC Oscilla-

tor. This byte resides in the high byte of address 0x000. During reset, this byte is automatically

written into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator.

Table 28-5. Fuse Low Byte

Fuse Low Byte

Bit No

Description

Default Value

CKDIV8

(1)

Divide clock by 8

0 (programmed)

CKOUT

Clock Output Enable

1 (unprogrammed)

SUT1

Select start-up time

1 (unprogrammed)

(2)

SUT0

Select start-up time

0 (programmed)

(2)

CKSEL3

Select Clock source

0 (programmed)

(3)

CKSEL2

Select Clock source

0 (programmed)

(3)

CKSEL1

Select Clock source

1 (unprogrammed)

(3)

CKSEL0

Select Clock source

0 (programmed)

(3)

Table 28-6. Device ID

Parts

Signature Bytes Address

0x000

0x001

0x002

ATtiny24

0x1E

0x91

0x0B

ATtiny44

0x1E

0x92

0x07

ATtiny84

0x1E

0x93

0x0C

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