ATTINY12L-4SU Atmel, ATTINY12L-4SU Datasheet - Page 28
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ATTINY12L-4SU
Manufacturer Part Number
ATTINY12L-4SU
Description
Microcontrollers (MCU) AVR 1K FLASH 64B EE 3V 4MHZ
Manufacturer
Atmel
Datasheet
1.ATTINY12V-1SI.pdf
(94 pages)
Specifications of ATTINY12L-4SU
Processor Series
ATTINY1x
Core
AVR8
Data Bus Width
8 bit
Program Memory Type
Flash
Program Memory Size
1 KB
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
6
Number Of Timers
1
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500
Minimum Operating Temperature
- 40 C
Package
8SOIC EIAJ
Device Core
AVR
Family Name
ATtiny
Maximum Speed
4 MHz
Operating Supply Voltage
3.3|5 V
Interface Type
SPI
Operating Temperature
-40 to 85 °C
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY12L-4SU
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Watchdog Reset
Register Description
MCU Status Register –
MCUSR of the ATtiny11
28
ATtiny11/12
When the Watchdog times out, it will generate a short reset pulse of 1 CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
(t
Figure 21. Watchdog Reset during Operation
The MCU Status Register provides information on which reset source caused an MCU
reset.
• Bit 7..2 - Res: Reserved Bits
These bits are reserved bits in the ATtiny11 and always read as zero.
• Bit 1 - EXTRF: EXTernal Reset Flag
After a power-on reset, this bit is undefined (X). It will be set by an external reset. A
watchdog reset will leave this bit unchanged.
• Bit 0 - PORF: Power-on Reset Flag
This bit is set by a power-on reset. A watchdog reset or an external reset will leave this
bit unchanged.
To summarize, the following table shows the value of these two bits after the three
modes of reset.
Table 12. PORF and EXTRF Values after Reset
Bit
$34
Read/Write
Initial Value
TOUT
Reset Source
Power-on
External Reset
Watchdog Reset
). Refer to page 43 for details on operation of the Watchdog.
V
CC
R
7
0
-
R
6
0
-
R
5
0
-
CK
R
4
0
-
Unchanged
Undefined
EXTRF
1
R
3
0
-
2
R
0
-
EXTRF
See bit description
R/W
1
Unchanged
Unchanged
PORF
PORF
R/W
1
1006F–AVR–06/07
0
MCUSR