ATTINY88-MMHR Atmel, ATTINY88-MMHR Datasheet - Page 44

• Manufacturer Part Number: ATTINY88-MMHR
• Description: MCU AVR 8KB FLASH 12MHZ 28QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY88-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: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 512 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

8.2.2
8.2.3
44
ATtiny48/88
External Reset
Brown-Out Detection
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
running. Shorter pulses are not guaranteed to generate a reset. When the applied signal
reaches the Reset Threshold Voltage – V
MCU after the Time-out period – t
RSTDISBL fuse, see
Figure 8-4.
ATtiny48/88 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
ing operation by comparing it to a fixed trigger level. The trigger level for the BOD can be
selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free
Brown-out Detection. The hysteresis on the detection level should be interpreted as V
V
value below the trigger level (V
When V
MCU after the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 8-5.
BOT
+ V
CC
HYST
BOD
CC
increases above the trigger level (V
/2 and V
given in
External Reset During Operation
Brown-out Reset During Operation
INTERNAL
TIME-OUT
RESET
RESET
V
CC
Table 20-4 on page
BOT-
“System and Reset Characterizations” on page
= V
Table 22-3 on page
BOT
BOT-
TOUT
TOUT
- V
in
HYST
has expired.
Figure
V
– has expired. The External Reset can be disabled by the
BOT-
/2. When the BOD is enabled, and V
RST
189.
CC
8-5), the Brown-out Reset is immediately activated.
– on its positive edge, the delay counter starts the
if the voltage stays below the trigger level for lon-
209) will generate a reset, even if the clock is not
BOT+
in
Figure
V
t
TOUT
8-5), the delay counter starts the
BOT+
209.
CC
decreases to a
8008G–AVR–04/11
CC
level dur-
BOT+
=