ST7265X View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7265X

Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM

STMicroelectronics 

ST7265x

POWER SUPPLY MANAGEMENT (Cont’d)

Figure 25. Power Supply Management: Dual Power Supply

STAND-ALONE

SUPPLY

USBVIT+

USBVIT-

VPLLmin48

SUPPLY

VOLTAGES

USBVDD

PLG INTERRUPT

REQUEST

RESET

S/W

STATUS

RESET

STAND-ALONE 1 2

PROCESSING

RESET

USB MODE

PROCESS.

1

2

RST

STAND-ALONE MODE

PROCESSING

RESET

USBEN

HI-Z

S/W Reset

S/W Reset

ON

HI-Z

VDD pin

voltage

VIT+(LVD)

STAND-ALONE

PLL

ON/OFF

PLL OFF

USB MODE

PLL ON

48 MHz

SIGNAL

CLOCK

SOURCE

NO CLOCK

CRYSTAL (12MHz)

UFINNDEED3 STABLE 48 MHz 4

PLL

STAND-ALONE

VIT-(LVD)

PLL OFF

NO CLOCK

CRYSTAL (12MHz)

1. Interrupt processing

2. Finish current processing

3. PLL start-up time (automatically controlled by hardware following a software reset)

4. PLL running with frequency in the range of 48 to 24 MHz (see section 13.3.3 on page 131)

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