ST7265X datasheet(40/166 Pages) STMICROELECTRONICS

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ST7265x

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POWER SUPPLY MANAGEMENT (Cont’d)

6.4.5 Register Description

POWER CONTROL REGISTER (PCR)

Reset Value: 0000 0000 (00h)

Bit 7 = ITPF

Voltage Input Threshold Plus Flag

This bit is set by hardware when USBVDD rises

over USBVIT+ and cleared by hardware when US-

BVDD drops below USBVIT+.

0: USBVDD < USBVIT+

1:USBVDD > USBVIT+

Bit 6 = ITMF

Voltage Input Threshold Minus Flag

This bit is set by hardware when USBVDD rises

over USBVIT- and cleared by hardware when US-

BVDD drops below USBVIT-.

0: USBVDD < USBVIT-

1:USBVDD > USBVIT-

Bit 5 = PLG

USB Plug/Unplug detection.

This bit is set by hardware when it detects that the

USB cable has been plugged in. It is cleared by

hardware when the USB cable is unplugged. (De-

tection happens when USBVDD rises over USB-

VIT+ or when USBVDD drops below USBVIT-). If

the PLGIE bit is set, the rising edge of the PLG bit

also generates an interrupt request.

0: USB cable unplugged

1: USB cable plugged in

Bit 4 = PLGIE

USB Plug/Unplug Interrupt Enable.

This bit is set and cleared by software.

0: Single supply mode: PLG interrupt disabled.

1: Dual supply mode: PLG interrupt enabled (gen-

erates an interrupt on the rising edge of PLG).

Bit 3:2 = VSET[1:0]

Voltage Regulator Output

Voltage.

These bits are set and cleared by software to se-

lect the output voltage of the on-chip voltage regu-

lator (for the VDDF output).

Bit 1 = DETEN

USB Voltage Detector Enable.

This bit is set and cleared by software. It is used to

power-off the USB voltage detector in Stand-alone

mode.

0: The USB voltage detector is enabled.

1: The USB voltage detector disabled (ITPF, ITMF

and PLG bits are forced high)

Bit 0 = REGEN

Voltage Regulator Enable.

This bit is set and cleared by software.

0: The regulator is completely shutdown and no

current is drawn from the power supply by the

voltage reference.

1: The on-chip voltage regulator is powered-on.

ITPF

ITM

PLG

VSE

DET

REG

VSE

Voltage output of the regulator

3.5V

3.4V

3.3V

2.8V

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