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35. Datasheet Revision History

Please note that the referring page numbers in this section are referred to this document. The

referring revision in this section are referring to the document revision.

35.1 Rev. 2545M-09/07

35.2 Rev. 2545L-08/07

35.3 Rev. 2545K-04/07

35.4 Rev. 2545J-12/06

35.5 Rev. 2545I-11/06

35.6 Rev. 2545H-10/06

1. Added “Data Retention” on page 8.

2. Updated “ADC Characteristics” on page 312.

3. “Preliminary“ removed through the datasheet.

1. Updated “Features” on page 1.

2. Updated code example in “MCUCR – MCU Control Register” on page 65.

3. Updated “System and Reset Characteristics” on page 308.

4. Updated Note in Table 8-3 on page 31, Table 8-5 on page 32, Table 8-8 on page 35,

Table 8-10 on page 35.

1. Updated “Interrupts” on page 57.

2. Updated“Errata ATmega48” on page 357 .

3. Changed description in “Analog-to-Digital Converter” on page 245.

1. Updated “Features” on page 1.

2. Updated Table 1-1 on page 2.

3. Updated “Ordering Information” on page 350.

4. Updated “Packaging Information” on page 353.

1. Updated “Features” on page 1.

2. Updated Features in “2-wire Serial Interface” on page 210.

3. Fixed typos in Table 28-3 on page 308.

1. Updated typos.

2. Updated “Features” on page 1.

3. Updated “Calibrated Internal RC Oscillator” on page 34.

4. Updated “System Control and Reset” on page 46.

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35.7 Rev. 2545G-06/06

35.8 Rev. 2545F-05/05

5. Updated “Brown-out Detection” on page 48.

6. Updated “Fast PWM Mode” on page 122.

7. Updated bit description in “TCCR1C – Timer/Counter1 Control Register C” on page

134.

8. Updated code example in “SPI – Serial Peripheral Interface” on page 162.

9. Updated Table 14-3 on page 102, Table 14-6 on page 103, Table 14-8 on page 104,

Table 15-2 on page 131, Table 15-3 on page 132, Table 15-4 on page 133, Table 17-

3 on page 155, Table 17-6 on page 156, Table 17-8 on page 157, and Table 27-5 on

page 288.

10. Added Note to Table 25-1 on page 266, Table 26-5 on page 280, and Table 27-17 on

page 301.

11. Updated “Setting the Boot Loader Lock Bits by SPM” on page 278.

12. Updated “Signature Bytes” on page 289

13. Updated “Electrical Characteristics” on page 304.

14. Updated “Errata” on page 357.

1. Added Addresses in Registers.

2. Updated “Calibrated Internal RC Oscillator” on page 34.

3. Updated Table 8-12 on page 36, Table 9-1 on page 40, Table 10-1 on page 55, Table

13-3 on page 79.

4. Updated “ADC Noise Reduction Mode” on page 41.

5. Updated note for Table 9-2 on page 44.

6. Updatad “Bit 2 - PRSPI: Power Reduction Serial Peripheral Interface” on page 45.

7. Updated “TCCR0B – Timer/Counter Control Register B” on page 105.

8. Updated “Fast PWM Mode” on page 122.

9. Updated “Asynchronous Operation of Timer/Counter2” on page 152.

10. Updated “SPI – Serial Peripheral Interface” on page 162.

11. Updated “UCSRnA – USART MSPIM Control and Status Register n A” on page 207.

12. Updated note in “Bit Rate Generator Unit” on page 217.

13. Updated “Bit 6 – ACBG: Analog Comparator Bandgap Select” on page 243.

14. Updated Features in

“Analog-to-Digital Converter” on page 245.

15. Updated “Prescaling and Conversion Timing” on page 248.

16. Updated “Limitations of debugWIRE” on page 262.

17 Added Table 28-1 on page 307.

18. Updated Figure 15-7 on page 123, Figure 29-44 on page 339.

19. Updated rev. A in “Errata ATmega48” on page 357.

20. Added rev. C and D in “Errata ATmega48” on page 357.

1. Added Section 3. “Resources” on page 7

2. Update Section 8.6 “Calibrated Internal RC Oscillator” on page 34.

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35.9 Rev. 2545E-02/05

35.10 Rev. 2545D-07/04

35.11 Rev. 2545C-04/04

3. Updated Section 27.8.3 “Serial Programming Instruction set” on page 301.

4. Table notes in Section 28.2 “DC Characteristics” on page 304 updated.

5. Updated Section 34. “Errata” on page 357.

1. MLF-package alternative changed to “Quad Flat No-Lead/Micro Lead Frame Package

QFN/MLF”.

2. Updated “EECR – The EEPROM Control Register” on page 23.

3. Updated “Calibrated Internal RC Oscillator” on page 34.

4. Updated “External Clock” on page 36.

5. Updated Table 28-3 on page 308, Table 28-6 on page 310, Table 28-2 on page

307and Table 27-16 on page 301

6. Added “Pin Change Interrupt Timing” on page 67

7. Updated “8-bit Timer/Counter Block Diagram” on page 91.

8. Updated “SPMCSR – Store Program Memory Control and Status Register” on page

268.

9. Updated “Enter Programming Mode” on page 292.

10. Updated “DC Characteristics” on page 304.

11. Updated “Ordering Information” on page 350.

12. Updated “Errata ATmega88” on page 360 and “Errata ATmega168” on page 361.

1. Updated instructions used with WDTCSR in relevant code examples.

2. Updated Table 8-5 on page 32, Table 28-4 on page 308, Table 26-9 on page 283,

and Table 26-11 on page 284.

3. Updated “System Clock Prescaler” on page 37.

4. Moved “TIMSK2 – Timer/Counter2 Interrupt Mask Register” and

“TIFR2 – Timer/Counter2 Interrupt Flag Register” to

“Register Description” on page 154.

5. Updated cross-reference in “Electrical Interconnection” on page 211.

6. Updated equation in “Bit Rate Generator Unit” on page 217.

7. Added “Page Size” on page 290.

8. Updated “Serial Programming Algorithm” on page 300.

9. Updated Ordering Information for “ATmega168” on page 352.

10. Updated “Errata ATmega88” on page 360 and “Errata ATmega168” on page 361.

11. Updated equation in “Bit Rate Generator Unit” on page 217.

1. Speed Grades changed: 12MHz to 10MHz and 24MHz to 20MHz

2. Updated “Speed Grades” on page 306.

3. Updated “Ordering Information” on page 350.

4. Updated “Errata ATmega88” on page 360

Part #	ATMEGA48-20AU
Description	MCU 8BIT ATMEGA RISC 4KB FLASH 3.3V/5V 32TQFP - Trays
Category	IC
Availability	Out of Stock
Qty	0

ATMEGA48-20AU

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