ATTINY40-MMHR Atmel, ATTINY40-MMHR Datasheet - Page 36
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
- Current page: 36 of 216
- Download datasheet (7Mb)
8.4.1
8.4.1.1
8.4.1.2
36
ATtiny40
Procedure for Changing the Watchdog Timer Configuration
Safety Level 1
Safety Level 2
Figure 8-7.
The Wathdog Timer can also be configured to generate an interrupt instead of a reset. This can
be very helpful when using the Watchdog to wake-up from Power-down.
To prevent unintentional disabling of the Watchdog or unintentional change of time-out period,
two different safety levels are selected by the fuse WDTON as shown in
See
Table 8-1.
The sequence for changing configuration differs between the two safety levels, as follows:
In this mode, the Watchdog Timer is initially disabled, but can be enabled by writing the WDE bit
to one without any restriction. A special sequence is needed when disabling an enabled Watch-
dog Timer. To disable an enabled Watchdog Timer, the following procedure must be followed:
In this mode, the Watchdog Timer is always enabled, and the WDE bit will always read as one. A
protected change is needed when changing the Watchdog Time-out period. To change the
Watchdog Time-out, the following procedure must be followed:
WDTON
Unprogrammed
Programmed
1. Write the signature for change enable of protected I/O registers to register CCP
2. Within four instruction cycles, in the same operation, write WDE and WDP bits
1. Write the signature for change enable of protected I/O registers to register CCP
2. Within four instruction cycles, write the WDP bit. The value written to WDE is irrelevant
“Procedure for Changing the Watchdog Timer Configuration” on page 36
Watchdog Timer
WDT Configuration as a Function of the Fuse Settings of WDTON
Safety
Level
1
2
WATCHDOG
OSCILLATOR
RESET
128 kHz
WDP0
WDP1
WDP2
WDP3
WDE
WDT
Initial State
Disabled
Enabled
How to
Disable the WDT
Protected change
sequence
Always enabled
MCU RESET
PRESCALER
WATCHDOG
MUX
How to
Change Time-out
No limitations
Protected change
sequence
Table 8-1 on page
for details.
8263A–AVR–08/10
36.
Related parts for ATTINY40-MMHR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATtiny40](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATTINY40-SU](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC MCU AVR 4K FLASH 20SOIC
Manufacturer:
Atmel
Datasheet:
![ATTINY40-XU](/photos/39/70/397036/tssop20_tmb.jpg)
Part Number:
Description:
IC MCU AVR 4K FLASH 20TSSOP
Manufacturer:
Atmel
Datasheet:
![ATTINY40-SUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC MCU AVR 4K FLASH 20SOIC
Manufacturer:
Atmel
Datasheet:
![ATTINY40-XUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC MCU AVR 4K FLASH 20TSSOP
Manufacturer:
Atmel
Datasheet:
![ATTINY40-MMH](/photos/30/99/309923/qfn-20_tmb.jpg)
Part Number:
Description:
IC MCU AVR 4KB FLASH 12MHZ 20QFN
Manufacturer:
Atmel
Datasheet:
![ATtiny4](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATTINY4-MAH](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) 512B FL 32B SRAM TIMER ATTINY4 12MHz
Manufacturer:
Atmel
![ATTINY4-TSHR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC MCU AVR 512B FLASH SOT-23-6
Manufacturer:
Atmel
Datasheet:
![ATTINY4-TS8R](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC MCU AVR 512B FLASH SOT-23-6
Manufacturer:
Atmel
Datasheet:
![ATSTK600](/photos/9/20/92038/atstk600_tmb.jpg)
Part Number:
Description:
DEV KIT FOR AVR/AVR32
Manufacturer:
Atmel
Datasheet:
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet: