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AT43USB325 Datasheet(PDF) 86 Page - ATMEL Corporation |
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AT43USB325 Datasheet(HTML) 86 Page - ATMEL Corporation |
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86 / 109 page  86 3355C–USB–4/05 AT43USB325 8.4.4 Hub Port Status Register The bits in this register are used by the microcontroller firmware when reporting a port's status through the Port Status Field, wPortStatus. Bits 3 (POCI) and 5 (PPSTAT) are used by the USB hardware and are the only two bits that the firmware should set or clear. All other bits should not be modified by the firmware. 8.4.4.1 Hub Port Status Register – HPSTAT1:5 • Bit 7 – Reserved This bit is reserved in the AT43USB325 and will read as zero. • Bit 6 – LSP: Low-speed Device Attached 0 = Full-speed device attached to this port 1 = Slow-speed device attached to this port Set to 0 for Port 1 (full-speed only). Set and cleared by the hardware upon detection of device at EOF2. • Bit 5 – PPSTAT: Port Power Status 0 = Port is powered OFF 1 = Port is powered ON Set to 1 for Port 1. Set and cleared based on present status of port power. • Bit 4 – PRSTAT: Port Reset Status 0 = Reset signaling not asserted 1 = Reset signaling asserted Set and cleared by the hardware as a result of initiating a port reset by Port Control Register. • Bit 3 – POCI: Port Overcurrent Indicator 0 = Power normal 1 = Overcurrent exist on port Set to 0 for Port 1. Set and cleared by firmware upon detection of an overcurrent or removal of an overcurrent. Bit 7 6 5 4 3 2 1 0 Port1 $1FB8 – LSP PPSTAT PRSTAT POCI PSSTAT PESTAT PCSTAT HPSTAT1 Port2 $1FB9 – LSP PPSTAT PRSTAT POCI PSSTAT PESTAT PCSTAT HPSTAT2 Port3 $1FBA – LSP PPSTAT PRSTAT POCI PSSTAT PESTAT PCSTAT HPSTAT3 Port4 $1FBB – LSP PPSTAT PRSTAT POCI PSSTAT PESTAT PCSTAT HPSTAT4 Port5 $1FBC – LSP PPSTAT PRSTAT POCI PSSTAT PESTAT PCSTAT HPSTAT5 Read/Write R R R/W R R/W R R R Initial Value 0 0 0 0 0 0 0 0 |
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