ATTINY40-MMHR Atmel, ATTINY40-MMHR Datasheet - Page 159
ATTINY40-MMHR
Manufacturer Part Number
ATTINY40-MMHR
Description
MCU AVR 4KB FLASH 12MHZ 3X3 QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY40-MMHR.pdf
(216 pages)
Specifications of ATTINY40-MMHR
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
18
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Manufacturer
Quantity
Price
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20.3.3.1
20.3.4
20.3.5
20.3.5.1
8263A–AVR–08/10
Signature Section
Calibration Section
Latching of Calibration Value
Latching of Configuration Bits
All configuration bits are latched either when the device is reset or when the device exits the
external programming mode. Changes to configuration bit values have no effect until the device
leaves the external programming mode.
The signature section is a dedicated memory area used for storing miscellaneous device infor-
mation, such as the device signature. Most of this memory section is reserved for internal use,
as shown in
Table 20-6.
ATtiny40 has a three-byte signature code, which can be used to identify the device. The three
bytes reside in the signature section, as shown in
given in
Table 20-7.
ATtiny40 has one calibration byte. The calibration byte contains the calibration data for the inter-
nal oscillator and resides in the calibration section, as shown in
calibration byte is automatically written into the OSCCAL register to ensure correct frequency of
the calibrated internal oscillator.
Table 20-8.
To ensure correct frequency of the calibrated internal oscillator the calibration value is automati-
cally written into the OSCCAL register during reset.
Signature word address
0x00
0x01
0x02 ... 0x3F
Part
ATtiny40
Calibration word address
0x00
0x01 ... 0x1F
Table
Table
Signature bytes
20-7.
Signature codes
Calibration byte
20-6.
Manufacturer ID
High byte
Device ID 1
Reserved for internal use
Reserved for internal use
Calibration word data
High byte
Reserved
Reserved
0x1E
Table
Signature Bytes
Signature word data
Device ID 1
20-6. The signature data for ATtiny40 is
0x92
Low byte
Internal oscillator calibration value
Reserved
Low byte
Manufacturer ID
Device ID 2
Reserved for internal use
Table
20-8. During reset, the
Device ID 2
0x0E
159
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