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

RESET SEQUENCE MANAGER (Cont’d)

In stand-alone mode, the 512 CPU clock cycle de-

lay allows the oscillator to stabilize and ensures

that recovery has taken place from the Reset

state.

Figure 20. Reset Delay in Stand-alone Mode

RESET

In USB mode the delay is 256 clock cycles count-

ed from when the PLL LOCK signal goes high.

The RESET vector fetch phase duration is 2 clock

cycles.

DELAY

512 x tCPU(STAND-ALONE)

FETCH VECTOR

Figure 21. Reset Delay in USB Mode

RESET

DELAY

256 x tCPU(STAND-ALONE)

PLL Startup

time (undefined)

400 µs typ.

256 x tCPU(USB) FETCH VECTOR

Note: For a description of Stand-alone mode and USB mode refer to Section 6.4.

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