AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 93

• Manufacturer Part Number: AT43USB325E-AC
• Description: IC USB KEYBOARD CTRLR HUB 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

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

8.5.4
8.5.4.1
8.5.4.2
3355C–USB–4/05
Suspend and Resume Process
Global Suspend
Global Resume
The Host stops sending packets, the hardware detects this as global suspend signaling and
stops all downstream signaling. Finally, the hardware asserts the GLB_SUSP interrupt.
The Host resumes signaling, the hardware detects this as global resume and propagates this
signaling to all downstream ports. Finally, the hardware enables the oscillator and asserts the
RSM interrupt.
1. Host stops sending packets
2. Global suspend signaling
3. Stop downstream signaling
4. Set GBL SUS bit
10. SLEEP bit detected
11. Shut off oscillator
1. Host resumes signaling
2. Resume signaling detected
3. Propagate signaling downstream
4. Enable oscillator
5. Set RSM bit
detected
Hardware
Hardware
interrupt
interrupt
5. Shut down any peripheral activity
6. Set Sleep Enable and Sleep Mode
7. Set GPIO to low power state if
8. Set UOVCER bit 2
9. Execute SLEEP instruction
6. Reset RSM and GBL SUSP bits
7. Restore GPIO states if required
8. Clear UOVCER bit 2
9. Enable peripheral activity
bits of MCUCR
required
Firmware
Firmware
AT43USB325
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