ATTINY12L-4PU Atmel, ATTINY12L-4PU Datasheet - Page 28

• Manufacturer Part Number: ATTINY12L-4PU
• Description: MCU 8-Bit ATtiny AVR RISC 1KB Flash 3.3V/5V 8-Pin PDIP
• Manufacturer: Atmel

Specifications of ATTINY12L-4PU

• Package: 8PDIP
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 4 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 6
• Interface Type: SPI
• Number Of Timers: 1
• Program Memory Size: 1 KB
• Program Memory Type: Flash
• Operating Temperature: -40 to 85 °C
• Processor Series: ATTINY1x
• Core: AVR8
• Maximum Clock Frequency: 4 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: PDIP-8
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

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