AVR533: Migrating from ATtiny2313 to

AVR533: Migrating from ATtiny2313 to
ATtiny2313A
8-bit
Microcontrollers
1 Introduction
In order to optimize the manufacturing process and to further reduce current
consumption, an optimized version of ATtiny2313 has been introduced.
Application Note
The ATtiny2313A is a functionally identical, drop-in replacement for the
ATtiny2313. All devices are subject to the same qualification process and same set
of production tests, but as the manufacturing process is not the same some
electrical characteristics differ.
ATtiny2313 and ATtiny2313A have separate datasheets. This application note
outlines the differences between the two devices and the datasheets. There is also
a detailed change log to assist the user at the end of the ATtiny2313A datasheet.
Remember to always use the latest revision of the device datasheet.
Minor differences in typical characteristics are not discussed in this document as
long as the low and high limits remain the same. For detailed information about the
typical characteristics, see sections “Electrical Characteristics” and “Typical
Characteristics” of the device datasheets.
Note: This application note serves as a guide to ease migration. For complete
device details, always refer to the most recent version of the ATtiny2313A
data sheet.
Rev. 8261B-AVR-04/10
2 Changes in Characteristics
This section outlines such differences in characteristics that may have an effect on
the application in which the device is used. For detailed information, refer to the most
recent version of the device data sheets.
2.1 Current Consumption
Active and Idle mode current consumption of the device have been reduced. The
table below present typical current consumption figures at room temperature. All
values are taken from device datasheets.
Table 2-1. Typical Current Consumption of Device at Room Temperature
Mode
Active
Idle
Condition
ATtiny2313
ATtiny2313A
Change
VCC = 2V, f = 1 MHz
250 µA
200 µA
-20 %
VCC = 3V, f = 4 MHz
1.5 mA
1.2 mA
-20 %
VCC = 5V, f = 8 MHz
5 mA
3.6 mA
-28 %
VCC = 2V, f = 1 MHz
80 µA
30 µA
-62 %
VCC = 3V, f = 4 MHz
410 µA
250 µA
-39 %
VCC = 5V, f = 8 MHz
1.6 mA
1.0 mA
-38 %
2.2 Reset
The table below summarizes the differences between the reset circuitry of ATtiny2313
and that of ATtiny2313A.
Table 2-2. Changes in Power-On Reset
ATtiny2313
Symbol
Min
Max
Unit
Min
Typ
Max
VPOR
1.2
1.1
1.4
1.6
V
VPOA
1.1
0.6
1.3
1.6
V
0.01
-
-
V/ms
SRON
2
Typ
ATtiny2313A
AVR533
8261B-AVR-04/10
AVR533
3 New or Updated Bits and Registers
In Table 3-1 are listed registers and bits that have been added or changed to the
device as a result of functional enhancements. Some bits were marked as reserved in
ATtiny2313 and some bits have another use in ATtiny2313A.
Table 3-1. New or Updated Bits and Registers in ATtiny2313A
Addr.
Name
0x07
BODCR
0x06
PRR
0x05
PCMSK2
0x04
PCMSK1
0x03
UCSRC
0x00
USIBR
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
PRTIM1
Bit 2
PRTIM0
Bit 1
Bit 0
BODS
BODSE
PRUSI PRUSART
PCINT17 PCINT16 PCINT15 PCINT14 PCINT13 PCINT12 PCINT11
PCINT10
PCINT9
PCINT8
UMSEL1 UMSEL0
USI Buffer Register
Table 3-2 lists interrupt vectors that have been added to ATtiny2313A. Depending on
how the firmware is constructed the below additions may have an effect on the start
address of the program.
Table 3-2. New Interrupt Vectors in ATtiny2313A
Vector
Address
Source
20
0x013
Pin Change Interrupt Request A
21
0x014
Pin Change Interrupt Request D
For more details on the functional enhancements, see ATtiny2313A datasheet.
4 Datasheet Changes
For a summary of changes, see the revision history at the end of the ATtiny2313A
data sheet.
3
8261B-AVR-04/10
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8261B-AVR-04/10