This is a summary document. A
complete document is available
on our Web site at
www.atmel.com
8-bit AVR Microcontroller
ATmega128A
DATASHEET SUMMARY
Introduction
The Atmel® ATmega128A is a low-power CMOS 8-bit microcontroller based
on the AVR® enhanced RISC architecture. By executing powerful instructions
in a single clock cycle, the ATmega128A achieves throughputs close to
1MIPS per MHz. This empowers system designer to optimize the device for
power consumption versus processing speed.
Features
• High-performance, Low-power Atmel AVR 8-bit Microcontroller
• Advanced RISC Architecture
– 133 Powerful Instructions - Most Single-clock Cycle Execution
– 32 × 8 General Purpose Working Registers + Peripheral Control
Registers
– Fully Static Operation
– Up to 16MIPS Throughput at 16MHz
– On-chip 2-cycle Multiplier
• High Endurance Non-volatile Memory segments
– 128Kbytes of In-System Self-programmable Flash program
memory
– 4Kbytes EEPROM
– 4Kbytes Internal SRAM
– Write/Erase cycles: 10,000 Flash/100,000 EEPROM
– Data retention: 20 years at 85°C/100 years at 25°C
– Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True Read-While-Write Operation
– Up to 64 Kbytes Optional External Memory Space
– Programming Lock for Software Security
– SPI Interface for In-System Programming
• JTAG (IEEE std. 1149.1 Compliant) Interface
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support
(1)
Atmel-8151JS-8-bit AVR Microcontroller_Datasheet_Summary-09/2015
– Programming of Flash, EEPROM, Fuses and Lock Bits through the JTAG Interface
• Atmel QTouch® library support
– Capacitive touch buttons, sliders and wheels
– Atmel QTouch and QMatrix acquisition
– Up to 64 sense channels
• Peripheral Features
– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
– Two Expanded 16-bit Timer/Counters with Separate Prescaler, Compare Mode and Capture
Mode
– Real Time Counter with Separate Oscillator
– Two 8-bit PWM Channels
– 6 PWM Channels with Programmable Resolution from 2 to 16 Bits
– Output Compare Modulator
– 8-channel, 10-bit ADC
• 8 Single-ended Channels
• 7 Differential Channels
• 2 Differential Channels with Programmable Gain at 1x, 10x, or 200x
– Byte-oriented Two-wire Serial Interface
– Dual Programmable Serial USARTs
– Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with On-chip Oscillator
– On-chip Analog Comparator
• Special Microcontroller Features
– Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator
– External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and
Extended Standby
– Software Selectable Clock Frequency
– ATmega103 Compatibility Mode Selected by a Fuse
– Global Pull-up Disable
• I/O and Packages
– 53 Programmable I/O Lines
– 64-lead TQFP and 64-pad QFN/MLF
• Operating Voltages
– 2.7 - 5.5V
• Speed Grades
– 0 - 16MHz
Atmel ATmega128A [DATASHEET]
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2
Table of Contents
Introduction......................................................................................................................1
Features.......................................................................................................................... 1
1. Description.................................................................................................................4
2. Configuration Summary............................................................................................. 5
3. Ordering Information..................................................................................................6
4. Block Diagram........................................................................................................... 7
5. ATmega103 and ATmega128A Compatibility............................................................ 8
5.1. ATmega103 Compatibility Mode...................................................................................................8
6. Pin Configurations..................................................................................................... 9
6.1. Pin Descriptions............................................................................................................................9
7. Resources................................................................................................................12
8. Data Retention.........................................................................................................13
9. About Code Examples.............................................................................................14
10. Capacitive Touch Sensing....................................................................................... 15
11. Packaging Information............................................................................................. 16
11.1. 64A............................................................................................................................................. 16
11.2. 64M1...........................................................................................................................................17
12. Errata.......................................................................................................................18
12.1. ATmega128A Rev. U..................................................................................................................18
1. Description
The Atmel AVR core combines a rich instruction set with 32 general purpose working registers. All the 32
registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to
be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code
efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The ATmega128A provides the following features: 128Kbytes of In-System Programmable Flash with
Read- While-Write capabilities, 4Kbytes EEPROM, 4Kbytes SRAM, 53 general purpose I/O lines, 32
general purpose working registers, Real Time Counter (RTC), four flexible Timer/Counters with compare
modes and PWM, 2 USARTs, one byte oriented Two-wire Serial Interface, an 8-channel, 10-bit ADC with
optional differential input stage with programmable gain, programmable Watchdog Timer with Internal
Oscillator, one SPI serial port, IEEE std. 1149.1 compliant JTAG test interface, also used for accessing
the On-chip Debug system and programming and six software selectable power saving modes. The Idle
mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to
continue functioning. The Power-down mode saves the register contents but freezes the Oscillator,
disabling all other chip functions until the next interrupt or Hardware Reset. In Power-save mode, the
asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the
device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except
Asynchronous Timer and ADC, to minimize switching noise during ADC conversions. In Standby mode,
the Crystal/Resonator Oscillator is running while the rest of the device is sleeping. This allows very fast
start-up combined with low power consumption. In Extended Standby mode, both the main Oscillator and
the Asynchronous Timer continue to run.
The device is manufactured using Atmel’s high-density nonvolatile memory technology. The On-chip ISP
Flash allows the program memory to be reprogrammed in-system through an SPI serial interface, by a
conventional nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core.
The boot program can use any interface to download the application program in the application Flash
memory. Software in the Boot Flash section will continue to run while the Application Flash section is
updated, providing true Read- While-Write operation. By combining an 8-bit RISC CPU with In-System
Self-Programmable Flash on a monolithic chip, the Atmel ATmega128A is a powerful microcontroller that
provides a highly flexible and cost effective solution to many embedded control application
The ATmega128A AVR is supported with a full suite of program and system development tools including:
C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits.
Atmel ATmega128A [DATASHEET]
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2. Configuration Summary
Features ATmega128A
Pin count 64
Flash (KB) 128
SRAM (KB) 4
EEPROM (KB) 4
External Memory (KB) 64
General Purpose I/O pins 53
SPI 1
TWI (I2C) 1
USART 2
ADC 10-bit, up to 76.9ksps (15ksps at max resolution)
ADC channels 6 (8 in TQFP and QFN/MLF packages)
AC propagation delay Typ 400ns
8-bit Timer/Counters 2
16-bit Timer/Counters 2
PWM channels 6
RC Oscillator +/-3%
VREF Bandgap
Operating voltage 2.7 - 5.5V
Max operating frequency 16MHz
Temperature range -55°C to +125°C
JTAG Yes
Atmel ATmega128A [DATASHEET]
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3. Ordering Information
Speed (MHz) Power Supply Ordering Code
ATmega128A-AU
ATmega128A-AUR
16 2.7 - 5.5V
ATmega128A-MU
ATmega128A-MUR
(2)
(3)
(3)
Package
64A
64A
64M1
64M1
(1)
Operational Range
Industrial (-40oC to 85oC)
Note:
1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for
detailed ordering information and minimum quantities.
2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances
(RoHS directive). Also Halide free and fully Green.
3. Tape and Reel
Package Type
64A 64-lead, 14 × 14 × 1.0 mm, Thin Profile Plastic Quad Flat Package (TQFP)
64M1 64-pad, 9 × 9 × 1.0 mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)
Atmel ATmega128A [DATASHEET]
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4. Block Diagram
Figure 4-1 Block Diagram
SRAM
TCK
TMS
TDI
TDO
PEN
PDI
PDO
SCK
XTAL1
XTAL2
TOSC1
TOSC2
VCC
RESET
GND
JTAG
PARPROG
SERPROG
Clock generation
8MHz
Crystal Osc
12MHz
External
RC Osc
32.768kHz
XOSC
Power
Supervision
POR/BOD &
RESET
8MHz
Calib RC
External
clock
1MHz int
osc
MISO
MOSI
SCK
SS
SDA
SCL
RxD0
TxD0
XCK0
RxD1
TxD1
XCK1
OCD
NVM
programming
Power
management
and clock
control
Watchdog
Timer
Internal
Reference
SPI
TWI
USART 0
USART 1
CPU
D
A
T
A
B
U
S
EEPROMIF
ExtMem
I/O
PORTS
ExtInt
ADC
AC
TC 0
(8-bit async)
TC 1
(16-bit)
TC 2
(8-bit)
TC 3
(16-bit)
FLASH
EEPROM
AD[7:0]
A[15:8]
RD/WR/ALE
PA[7:0]
PB[7:0]
PC[7:0]
PD[7:0]
PE[7:0]
PF[7:0]
PG[4:0]
INT[7:0]
ADC[7:0]
AREF
AIN0
AIN1
ACO
ADCMUX
OC0
OC1A/B/C
T1
ICP1
T2
OC2
OC3A/B
T3
ICP3
Atmel ATmega128A [DATASHEET]
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5. ATmega103 and ATmega128A Compatibility
The ATmega128A is a highly complex microcontroller where the number of I/O locations supersedes the
64 I/O locations reserved in the AVR instruction set. To ensure backward compatibility with the
ATmega103, all I/O locations present in ATmega103 have the same location in ATmega128A. Most
additional I/O locations are added in an Extended I/O space starting from 0x60 to 0xFF, (that is, in the
ATmega103 internal RAM space). These locations can be reached by using LD/LDS/LDD and
ST/STS/STD instructions only, not by using IN and OUT instructions. The relocation of the internal RAM
space may still be a problem for ATmega103 users. Also, the increased number of interrupt vectors might
be a problem if the code uses absolute addresses. To solve these problems, an ATmega103 compatibility
mode can be selected by programming the fuse M103C. In this mode, none of the functions in the
Extended I/O space are in use, so the internal RAM is located as in ATmega103. Also, the Extended
Interrupt vectors are removed.
The Atmel AVR ATmega128A is 100% pin compatible with ATmega103, and can replace the ATmega103
on current Printed Circuit Boards. The application note “Replacing ATmega103 by ATmega128A”
describes what the user should be aware of replacing the ATmega103 by an ATmega128A.
5.1. ATmega103 Compatibility Mode
By programming the M103C fuse, the ATmega128A will be compatible with the ATmega103 regards to
RAM, I/O pins and interrupt vectors as described above. However, some new features in ATmega128A
are not available in this compatibility mode, these features are listed below:
• One USART instead of two, Asynchronous mode only. Only the eight least significant bits of the
Baud Rate Register is available.
• One 16 bits Timer/Counter with two compare registers instead of two 16-bit Timer/Counters with
three compare registers.
• Two-wire serial interface is not supported.
• Port C is output only.
• Port G serves alternate functions only (not a general I/O port).
• Port F serves as digital input only in addition to analog input to the ADC.
• Boot Loader capabilities is not supported.
• It is not possible to adjust the frequency of the internal calibrated RC Oscillator.
• The External Memory Interface can not release any Address pins for general I/O, neither configure
different wait-states to different External Memory Address sections.
• In addition, there are some other minor differences to make it more compatible to ATmega103:
• Only EXTRF and PORF exists in MCUCSR.
• Timed sequence not required for Watchdog Time-out change.
• External Interrupt pins 3 - 0 serve as level interrupt only.
• USART has no FIFO buffer, so data overrun comes earlier.
Unused I/O bits in ATmega103 should be written to 0 to ensure same operation in ATmega128A.
Atmel ATmega128A [DATASHEET]
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6. Pin Configurations
Figure 6-1 Pinout ATmega128A
Power
Ground
Programming/debug
Digital
Analog
Crystal/Osc
External Memory
PEN
(RXD0/PDI) PE0
(TXD0/PDO) PE1
(XCK0/AIN0) PE2
(OC3A/AIN1) PE3
(OC3B/INT4) PE4
(OC3C/INT5) PE5
(T3/INT6) PE6
(ICP3/INT7) PE7
(SS) PB0
(SCK) PB1
(MOSI) PB2
(MISO) PB3
(OC0) PB4
(OC1A) PB5
(OC1B) PB6
10
11
12
13
14
15
16
AVCC
GND
64
63
1
2
3
4
5
6
7
8
9
17
18
PF0 (ADC0)
AREF
62
61
19
20
60
21
59
22
58
23
57
24
56
25
55
26
54
27
53
28
VCC
52
29
PA0 (AD0)
PA1 (AD1)
51
50
31
30
PA2 (AD2)
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
PA3 (AD3)
PA4 (AD4)
PA5 (AD5)
PA6 (AD6)
PA7 (AD7)
PG2 (ALE)
PC7 (A15)
PC6 (A14)
PC5 (A13)
PC4 (A12)
PC3 (A11)
PC2 (A10)
PC1 (A9)
PC0 (A8)
PG1 (RD)
PG0 (WR)
GND
PF7 (ADC7/TDI)
PF6 (ADC6/TDO)
PF5 (ADC5/TMS)
PF4 (ADC4/TCK)
PF3 (ADC3)
PF2 (ADC2)
PF1 (ADC1)
Note: The Pinout figure applies to both TQFP and MLF packages. The bottom pad under the QFN/MLF
package should be soldered to ground.
6.1. Pin Descriptions
6.1.1. V
CC
Digital supply voltage.
RESET
(TOSC2) PG3
(TOSC1) PG4
(OC2/OC1C) PB7
VCC
GND
XTAL2
XTAL1
(SCL/INT0) PD0
(SDA/INT1) PD1
(ICP1) PD4
(TXD1/INT3) PD3
(RXD1/INT2) PD2
(T1) PD6
(XCK1) PD5
Atmel ATmega128A [DATASHEET]
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(T2) PD7
9
6.1.2. GND
Ground.
6.1.3. Port A (PA7:PA0)
Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port A
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port A pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
A pins are tristated when a reset condition becomes active, even if the clock is not running.
Port A also serves the functions of various special features of the ATmega128A as listed in Alternate
Functions of Port A.
6.1.4. Port B (PB7:PB0)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
B pins are tristated when a reset condition becomes active, even if the clock is not running.
Port B also serves the functions of various special features of the ATmega128A as listed in Alternate
Functions of Port B.
6.1.5. Port C (PC7:PC0)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
C pins are tristated when a reset condition becomes active, even if the clock is not running.
Port C also serves the functions of special features of the ATmega128A as listed in Alternate Functions of
Port C. In ATmega103 compatibility mode, Port C is output only, and the port C pins are not tri-stated
when a reset condition becomes active.
Note: The Atmel AVR ATmega128A is by default shipped in ATmega103 compatibility mode. Thus, if the
parts are not programmed before they are put on the PCB, PORTC will be output during first power up,
and until the ATmega103 compatibility mode is disabled.
6.1.6. Port D (PD7:PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
D pins are tristated when a reset condition becomes active, even if the clock is not running.
Port D also serves the functions of various special features of the ATmega128A as listed in Alternate
Functions of Port D.
6.1.7. Port E (PE7:PE0)
Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port E
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port E pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
E pins are tristated when a reset condition becomes active, even if the clock is not running.
Port E also serves the functions of various special features of the ATmega128A as listed in Alternate
Functions of Port E.
6.1.8. Port F (PF7:PF0)
Port F serves as the analog inputs to the A/D Converter.
Atmel ATmega128A [DATASHEET]
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Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins can
provide internal pull-up resistors (selected for each bit). The Port F output buffers have symmetrical drive
characteristics with both high sink and source capability. As inputs, Port F pins that are externally pulled
low will source current if the pull-up resistors are activated. The Port F pins are tri-stated when a reset
condition becomes active, even if the clock is not running. If the JTAG interface is enabled, the pull-up
resistors on pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even if a Reset occurs.
The TDO pin is tri-stated unless TAP states that shift out data are entered.
Port F also serves the functions of the JTAG interface.
In ATmega103 compatibility mode, Port F is an input Port only.
6.1.9. Port G (PG4:PG0)
Port G is a 5-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port G
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port G pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
G pins are tristated when a reset condition becomes active, even if the clock is not running.
Port G also serves the functions of various special features.
The port G pins are tri-stated when a reset condition becomes active, even if the clock is not running.
In Atmel AVR ATmega103 compatibility mode, these pins only serves as strobes signals to the external
memory as well as input to the 32kHz Oscillator, and the pins are initialized to PG0 = 1, PG1 = 1, and
PG2 = 0 asynchronously when a reset condition becomes active, even if the clock is not running. PG3
and PG4 are oscillator pins.
6.1.10. RESET
Reset input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if
the clock is not running. The minimum pulse length is given in System and Reset Characteristics. Shorter
pulses are not guaranteed to generate a reset.
6.1.11. XTAL1
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
6.1.12. XTAL2
Output from the inverting Oscillator amplifier.
6.1.13. AV
CC
AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally connected to VCC,
even if the ADC is not used. If the ADC is used, it should be connected to VCC through a low-pass filter.
6.1.14. AREF
AREF is the analog reference pin for the A/D Converter.
6.1.15. PEN
PEN is a programming enable pin for the SPI Serial Programming mode, and is internally pulled high. By
holding this pin low during a Power-on Reset, the device will enter the SPI Serial Programming mode.
PEN has no function during normal operation.
Atmel ATmega128A [DATASHEET]
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7. Resources
A comprehensive set of development tools, application notes and datasheets are available for download
on http://www.atmel.com/avr.
Atmel ATmega128A [DATASHEET]
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8. Data Retention
Reliability Qualification results show that the projected data retention failure rate is much less than 1 PPM
over 20 years at 85°C or 100 years at 25°C.
Atmel ATmega128A [DATASHEET]
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9. About Code Examples
This datasheet contains simple code examples that briefly show how to use various parts of the device.
These code examples assume that the part specific header file is included before compilation. Be aware
that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is
compiler dependent. Please confirm with the C compiler documentation for more details.
For I/O registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI” instructions
must be replaced with instructions that allow access to extended I/O. Typically “LDS” and “STS”
combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.
Atmel ATmega128A [DATASHEET]
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10. Capacitive Touch Sensing
The Atmel QTouch Library provides a simple to use solution to realize touch sensitive interfaces on most
Atmel AVR microcontrollers. The QTouch Library includes support for the QTouch and QMatrix
acquisition methods.
Touch sensing can be added to any application by linking the appropriate Atmel QTouch Library for the
AVR Microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors,
and then calling the touch sensing API’s to retrieve the channel information and determine the touch
sensor states.
The QTouch Library is FREE and downloadable from the Atmel website at the following location:
www.atmel.com/qtouchlibrary. For implementation details and other information, refer to the Atmel
QTouch Library User Guide - also available for download from the Atmel website.
®
Atmel ATmega128A [DATASHEET]
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11. Packaging Information
2325 Orchard Parkway
San Jose, CA 95131
TITLE
DRAWING NO.
REV.
64A, 64-le ad, 14 x 14mm Body Size, 1.0mm Bo dy Th ickness,
0.8mm Lead Pitch, Thin Prof le Plastic Quad Flat Package (TQFP)
C
64A
2010-10-20
PIN 1 IDENTIFIER
0°~7°
PIN 1
L
C
A1
A2 A
D1
D
e
E1 E
B
COMMON DIMENSIONS
(Un it of measure = mm)
SYMBOL
MIN
NOM
MAX
NOTE
Notes:
1.This packag e conforms to JEDEC reference MS-026, Variation AEB.
2. Dimensions D1 and E1 do not includ e mold prot rusion . Allowab le
protrusion is 0.25mm per side. Dime nsions D1 and E1 are maximum
plast ic bod y size dimen sions including mold mismatch.
3. Lead cop lanarity is 0.10mm maximu m.
A – – 1.20
A1 0.05 – 0.15
A2 0.95 1.00 1.05
D 15.75 16.00 16.25
D1 13.90 14.00 14.10 Not e 2
E 15.75 16.00 16.25
E1 13.90 14.00 14.10 Note 2
B 0.30 – 0.45
C 0.09 – 0.20
L 0.45 – 0.75
e 0.80 TYP
11.1. 64A
Atmel ATmega128A [DATASHEET]
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16
11.2. 64M1
2325 Orchard Pa rkway
San Jos e , CA 9513 1
TITLE
DRAWING N O.
RE V.
64M1, 64-pad, 9 x 9 x 1.0 mm Bod y, Lead Pitch 0.50 mm ,
H
64M1
2010-10-19
COMMON DIMENSIONS
(Un it of Measure = mm)
SYMBOL
MIN
NOM
MAX
NOTE
A 0.80 0.90 1.00
A1 – 0.02 0.05
b 0.18 0.25 0.30
D
D2 5.20 5.40 5.60
8.90 9.00 9.10
8.90 9.00 9.10
E
E2 5.20 5.40 5.60
e 0.50 BSC
L 0.35 0.40 0.45
Notes:
1. JEDEC Standard MO-220, (S AW Singulation) Fig . 1, VMM D.
2. Dimen sion and tole ran ce con form to ASMEY14.5M-1994 .
TOP VIE W
SIDE VIEW
BOTTOM VIE W
D
E
Marked Pin# 1 I D
SE ATING PLAN E
A1
C
A
C
0.08
1
2
3
K 1.25 1.40 1.55
E2
D2
b
e
Pin #1 Co rne r
L
Pin #1
Triang le
Pin #1
Cham fer
(C 0.30)
Option A
Option B
Pin #1
Notch
(0.20 R)
Option C
K
K
5.40 mm Exposed Pad, Micro Le ad Frame Pa ckage (MLF)
Atmel ATmega128A [DATASHEET]
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12. Errata
The revision letter in this section refers to the revision of the ATmega128A device.
12.1. ATmega128A Rev. U
• First Analog Comparator conversion may be delayed
• Interrupts may be lost when writing the timer registers in the asynchronous timer
• Stabilizing time needed when changing XDIV Register
• Stabilizing time needed when changing OSCCAL Register
• IDCODE masks data from TDI input
• Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request
1. First Analog Comparator conversion may be delayed
If the device is powered by a slow rising VCC, the first Analog Comparator conversion will take
longer than expected on some devices.
Problem Fix/Workaround
When the device has been powered or reset, disable then enable the Analog Comparator before
the first conversion.
2. Interrupts may be lost when writing the timer registers in the asynchronous timer
The interrupt will be lost if a timer register that is synchronous timer clock is written when the
asynchronous Timer/Counter register (TCNTx) is 0x00.
Problem Fix/Workaround
Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00
before writing to the asynchronous Timer Control Register (TCCRx), asynchronous Timer Counter
Register (TCNTx), or asynchronous Output Compare Register (OCRx).
3. Stabilizing time needed when changing XDIV Register
After increasing the source clock frequency more than 2% with settings in the XDIV register, the
device may execute some of the subsequent instructions incorrectly.
Problem Fix/Workaround
The NOP instruction will always be executed correctly also right after a frequency change. Thus,
the next 8 instructions after the change should be NOP instructions. To ensure this, follow this
procedure:
3.1. Clear the I bit in the SREG Register.
3.2. Set the new pre-scaling factor in XDIV register.
3.3. Execute 8 NOP instructions
3.4. Set the I bit in SREG
This will ensure that all subsequent instructions will execute correctly.
Assembly Code Example:
CLI ; clear global interrupt enable
OUT XDIV, temp ; set new prescale value
NOP ; no operation
NOP ; no operation
NOP ; no operation
Atmel ATmega128A [DATASHEET]
Atmel-8151JS-8-bit AVR Microcontroller_Datasheet_Summary-09/2015
18
NOP ; no operation
NOP ; no operation
NOP ; no operation
NOP ; no operation
NOP ; no operation
SEI ; set global interrupt enable
4. Stabilizing time needed when changing OSCCAL Register
After increasing the source clock frequency more than 2% with settings in the OSCCAL register, the
device may execute some of the subsequent instructions incorrectly.
Problem Fix/Workaround
The behavior follows errata number 3., and the same Fix / Workaround is applicable on this errata.
5. IDCODE masks data from TDI input
The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by
all-ones during Update-DR.
Problem Fix/Workaround
– If ATmega128A is the only device in the scan chain, the problem is not visible.
– Select the Device ID Register of the ATmega128A by issuing the IDCODE instruction or by
entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device
ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS
instruction to the ATmega128A while reading the Device ID Registers of preceding devices of
the boundary scan chain.
– If the Device IDs of all devices in the boundary scan chain must be captured simultaneously,
the ATmega128A must be the first device in the chain.
6. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request.
Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR register
triggers an unexpected EEPROM interrupt request.
Problem Fix/Workaround
Always use OUT or SBI to set EERE in EECR.
Atmel ATmega128A [DATASHEET]
Atmel-8151JS-8-bit AVR Microcontroller_Datasheet_Summary-09/2015
19
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