ATTINY48-MMHR Atmel, ATTINY48-MMHR Datasheet - Page 33

• Manufacturer Part Number: ATTINY48-MMHR
• Description: MCU AVR 4KB FLASH 12MHZ 28QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY48-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 24
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 256 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8008G–AVR–04/11
and temperature dependent, as shown in
245
Table 6-5.
The main purpose of the delay is to keep the AVR in reset until it is supplied with minimum V
The delay will not monitor the actual voltage and it will be required to select a delay longer than
the V
be used. A BOD circuit will ensure sufficient V
delay can be disabled. Disabling the time-out delay without utilizing a Brown-out Detection circuit
is not recommended.
The oscillator is required to oscillate for a minimum number of cycles before the clock is consid-
ered stable. An internal ripple counter monitors the oscillator output clock, and keeps the internal
reset active for a given number of clock cycles. The reset is then released and the device will
start to execute.
The start-up sequence for the clock includes both the time-out delay and the start-up time when
the device starts up from reset. When starting up from Power-down mode, V
at a sufficient level and only the start-up time is included.
CKSEL[1:0]
and
CC
rise time. If this is not possible, an internal or external Brown-out Detection circuit should
00
10
11
01
“Watchdog Oscillator Frequency vs. Temperature” on page
Length of Startup Sequence.
SUT[1:0]
XX
00
01
10
11
Number of WDT Cycles
“Watchdog Oscillator Frequency vs. VCC” on page
CC
4K (4,096)
8K (8,192)
Reserved
Reserved
before it releases the reset, and the time-out
0
246.
ATtiny48/88
Typical Time-out
CC
Reserved
Reserved
is assumed to be
64 ms
0 ms
4 ms
CC
33
.