AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 25
AT43USB325E-AC
Manufacturer Part Number
AT43USB325E-AC
Description
IC USB KEYBOARD CTRLR HUB 64LQFP
Manufacturer
Atmel
Series
AVR®r
Datasheet
1.AT43USB325E-AC.pdf
(109 pages)
Specifications of AT43USB325E-AC
Applications
Keyboard Controller
Core Processor
AVR
Program Memory Type
SRAM (16 kB)
Controller Series
AT43USB
Ram Size
512 x 8
Interface
SPI, 3-Wire Serial
Number Of I /o
42
Voltage - Supply
4.4 V ~ 5.25 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
64-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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4.7
4.8
3355C–USB–4/05
External Reset
Watchdog Timer Reset
An external reset is generated by a low-level on the RESET pin. Reset pulses longer than
200 ns will generate a reset. Shorter pulses are not guaranteed to generate a reset. When the
applied signal reaches the Reset Threshold Voltage - V
starts the MCU after the Time-out period t
Figure 4-4.
When the watchdog times out, it will generate a short reset pulse of 1 XTAL cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
Figure 4-5.
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
RESET
WDT
VCC
TIME-OUT
INTERNAL
RESET
RESET
VCC
External Reset During Operation
Watchdog Reset During Operation
V
RST
1 XTAL Cycle
t
TOUT
t
TOUT
TOUT
has expired.
RST
on its positive edge, the delay timer
AT43USB325
TOUT
.
25
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