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

USB INTERFACE (Cont’d)

11.3.5 Low Power modes

Mode

WAIT

HALT

Description

No effect on USB.

USB interrupt events cause the device to exit from WAIT mode.

USB registers are frozen.

In halt mode, the USB is inactive. USB operations resume when the MCU is woken up by an interrupt with

“exit from halt capability” or by an event on the USB line in case of suspend. This event will generate an

ESUSP interrupt which will wake-up from halt mode.

11.3.6 Interrupts

Interrupt Event

Correct TRansfer

Setup OVeRrun

ERROR

Suspend Mode Request

End of SUSPend mode.

USB RESET

Start Of Frame

Event Flag

Enable Con- Exit From

trol Bit

Wait

CTR

CTRM

Yes

SOVR

SOVRM

Yes

ERR

ERRM

Yes

SUSP

SUSPM

Yes

ESUSP

ESUSPM

Yes

RESET

RESETM

Yes

SOF

SOFM

Yes

Exit

From

Halt

No

No

No

No

Yes

No

No

Note: The USB end of suspend interrupt event is connected to a single interrupt vector (USB ESUSP) with

the exit from halt capability (wake-up). All the other interrupt events are connected to another interrupt

vector: USB interrupt (USB). They generate an interrupt if the corresponding enable control bit is set and

the interrupt mask bits (I0, I1) in CC register are reset (RIM instruction).

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