AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 66
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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8.1.3
66
AT43USB325
Setup Response State
The Function Interface Unit (FIU) receives a SETUP token with 8 bytes of data from the Host.
The FIU stores the data in the FIFO, sends an ACK back to the host and asserts an RX_SETUP
interrupt.
1. SETUP token, DATA from Host
2. ACK to Host
3. Store data in FIFO
4. Set RX SETUP
Hardware
INT
5. Read UISR
6. Read CSR0
7. Read Byte Count
8. Read FIFO
9. Parse command data
10. Write to H/FCAR0:
11. If Control Read: set DIR, clear RX
12. If Control Write: clear DIR in CAR0
13. If no Data Stage: set Data End,
14. Set UIAR[EP0 INTACK] to clear
SETUP, fill FIFO, set TX Packet
Ready in CAR0
clear DIR, set Force STALL in
CAR0
the interrupt source
Firmware
3355C–USB–4/05
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