AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 23
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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Figure 4-2.
4.5
3355C–USB–4/05
Reset Sources
AT43USB325 Interrupt Structure
BUS RESET
GLB SUSP
FRMWUP
EOF2
HEP0
FEP2
FEP1
FEP0
FEP3
SOF
INTA
INTB
INTC
INTD
RSM
The AT43USB325 has four sources of reset:
• Power-on Reset – The MCU is reset when the supply voltage is below the power-on reset
• External Reset – The MCU is reset when a low level is present on the RESET pin for more
• Watchdog Reset – The MCU is reset when the watchdog timer period expires and the
• USB Reset – The AT43USB325 has a feature to separate the USB and microcontroller
threshold.
than 50 ns.
watchdog is enabled.
resets. This feature is enabled by setting the BUS INT EN, bit 3 of the SPRSIE register. A
USB bus reset is defined as a SE0 (single ended zero) of at least 4 slow speed USB clock
cycles received by Port0. The internal reset pulse to the USB hardware and microcontroller
lasts for 24 oscillator periods.
– Resets not separated: A USB bus reset will also reset the microcontroller.
Suspend/Resume
USB Interrupt
Flag Register
Register
Enable Register
Suspend/Resume
Interrupt Enable
USB Interrupt
Register
Suspend/Resume
Mask Register
USB Interrupt
Interrupt Mask
Register
TIMER0 OVF
TIMER OVF
COMPB
COMPA
USB
RESET
INT1
INT0
Microcontroller
13
3
8
7
6
5
2
1
Interrupt
Logic
AT43USB325
23
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