ATTINY20-MMH Atmel, ATTINY20-MMH Datasheet - Page 34
![MCU AVR 2KB FLASH 12MHZ 20QFN](/photos/30/99/309958/qfn-16_sml.jpg)
ATTINY20-MMH
Manufacturer Part Number
ATTINY20-MMH
Description
MCU AVR 2KB FLASH 12MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY20-EK1.pdf
(224 pages)
Specifications of ATTINY20-MMH
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
12
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Processor Series
ATtiny
Core
AVR
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
SPI, TWI
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY20-MMHR
Manufacturer:
ATMEL
Quantity:
20 000
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8.4.1
8.4.1.1
8.4.1.2
34
ATtiny20
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 34
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.
8235B–AVR–04/11
34.
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