ST92E163-EPB/US STMicroelectronics, ST92E163-EPB/US Datasheet - Page 139
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ST92E163-EPB/US
Manufacturer Part Number
ST92E163-EPB/US
Description
KIT DEMO MASS STORAGE
Manufacturer
STMicroelectronics
Type
Microcontroller Programmerr
Datasheet
1.ST92E163-EPBUS.pdf
(230 pages)
Specifications of ST92E163-EPB/US
Contents
Programmer, Cable, Power Supply, Software, Manual and more
For Use With/related Products
ST9 MCUs
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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USB INTERFACE (Cont’d)
Procedure for entering Suspend Mode
1. Set the TIM_SUSP bit in the USBCTLR register
2. Clear both the Wake-up Pending Registers
3. Set the LP_SUSP bit in the USBCTLR register
4. Set the ID1S and WKUP-INT bits in the WUC-
5. Write the stop sequence 1, 0, 1 to the STOP bit
6. Insert at least 3 NOP instructions after the stop
7. Read the WKCTRL register.
Procedure for quitting Suspend Mode
There are two ways to wake up the ST9 from Stop
mode: USB bus activity or signal triggering on the
external wakeup lines.
– If the MCU is woken up by USB bus activity, an
– If the MCU is woken up by one of the external
“End of Suspend” interrupt is generated if it is en-
abled.
wakeup lines, an INTD1 interrupt is generated if
the INTD1 interrupt is enabled and the WKUP-
INT bit in the WUCTRL register (bit 0 of R249 in
page 57) is set.
(bit 6 of R252 in page 15) to suspend the digital
part of the USB cell.
WUPRH & WUPRL (R254 & R255 in page 57)
to flush all pending wakeup events.
(bit 1 of R252 in page 15) to put the USB cell in
Low Power Suspend mode.
TRL register (bit 0 & 1 of R249 in page 57) to
enable the interrupt from the wakeup lines.
of the WUCTRL (bit 2 of R249 in page 57) to
enter stop mode. This stop sequence has to be
executed as continuous sequence of write
instructions without any other register read/
write instructions within the sequence.
sequence in step 5 to allow the MCU clock to
stop.
If the STOP bit (bit 2) is 0, it means that the
MCU was stopped and is being woken up by an
external event.
If the STOP bit (bit 2) is 1, it means that the
stop sequence in step 5 was broken by an inter-
rupt or DMA request. In this case, step 5 has to
be executed again until the MCU is stopped.
– After the MCU is woken up, wait until the LOCK
– Check the bits in the Wake-up Pending Regis-
Procedure for sending the remote wakeup
(RESUME) signal
After the MCU has been woken up by one of the
external wakeup lines and the source of this wake-
up event is identified, the application may send a
remote wakeup (RESUME) signal using the fol-
lowing procedure:
1. To ensure that the host enables the remote
2. Clear the LP_SUSP bit in the USBCTLR regis-
3. Set the RESUME bit in the USBCTLR (bit 3 of
4. Clear the RESUME bit after 1 to 15 ms, to
5. Clear the ESUSP bit in the USBISTR register
6. An “End of Suspend” interrupt will be generated
Note: To reduce power consumption during Stop
mode, set as many I/O ports as possible to open
drain output mode and set all ports to 0.
bit in the CLK_FLAG register (bit 2 of R242 in
page 55) is at 1 to ensure that the clock PLL is
locked. Then set the CSU_CKSEL bit in the
CLK_FLAG register if it is necessary, since this
bit is cleared by hardware when the MCU stops.
ters WU_WUPRH & WU_WUPRL to determine
which pin has woken up the MCU. Then clear the
Wake-up Pending Registers.
wakeup feature:
ter (bit 1 of R252 in page 15) to power up the
USB transceiver. Do not clear the TIM_SUSP
bit in the USBCTLR register if an “End of Sus-
pend” interrupt is expected later.
R252 in page 15) to send the RESUME signal.
ensure that the RESUME signal lasts long
enough.
(bit 4 of R249 in page 15), since an “End of
Suspend” interrupt is generated by setting
RESUME bit falsely.
when the bus activity is resumed by the host, if
the TIM_SUSP bit is not cleared in step 2.
ST92163R4 - USB PERIPHERAL (USB)
139/230
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