ISP1161A1BD,151 STEricsson, ISP1161A1BD,151 Datasheet - Page 43

• Manufacturer Part Number: ISP1161A1BD,151
• Manufacturer: STEricsson

Specifications of ISP1161A1BD,151

• Lead Free Status / RoHS Status: Supplier Unconfirmed

ISP1161A1_4
Product data sheet
Fig 37. ISP1161A1 suspend and resume clock scheme.
9.9.2.1 Wake-up by pin H_WAKEUP
REGULATOR
9.9.2 HC wake-up from suspended state
VOLTAGE
XOSC
On
On
In the suspended state, the device will consume considerably less power by turning off the
internal 48 MHz clock, PLL and crystal, and setting the internal regulator to power-down
mode. The ISP1161A1 suspend and resume clock scheme is shown in
Remark: The ISP1161A1 can only be put into a fully suspended state only after both
the HC and the DC go into the suspend state. At this point, the crystal can be turned off
and the internal regulator can be put into power-down mode.
Pin H_SUSPEND is the sensing output pin for the HC’s suspended state. When the HC
goes into the USBSuspend state, this pin will output a HIGH level (logic 1). This pin is
cleared to LOW (logic 0) level only when the HC is put into a USBReset state or
USBOperational state (refer to the HcControl register bits 7 to 6, 01H to read, 81H to
write). Bit 11, SuspendClkNotStop, of the HcHardwareConfiguration register (20H to read,
A0H to write), defines if the HC internal clock is stopped or kept running when the HC
goes into the USBSuspend state. After the HC enters the USBSuspend state for 1.3 ms,
the internal clock will be stopped if bit SuspendClkNotStop is logic 0.
There are three methods to wake up the HC from the USBSuspend state: hardware
wake-up, software wake-up, and USB bus resume. They are described as follows:
Pins H_SUSPEND and H_WAKEUP provide hardware wake-up, a way of remote
wake-up control for the HC without the need to access the HC internal registers.
H_WAKEUP is an external wake-up control input pin for the HC. After the HC goes into
the USBSuspend state, it can be woken up by sending a HIGH level pulse to
pin H_WAKEUP. This will turn on the HC’s internal clock, and set bit 6, ClkReady, of the
Hc PInterrupt register (24H to read, A4H to write). Under the USBSuspend state, once
pin H_WAKEUP goes HIGH, after 160 s, the internal clock will be up. If pin H_WAKEUP
continues to be HIGH, then the internal clock will be kept running, and the microprocessor
can set the HC into the USBOperational state during this time. If H_WAKEUP goes LOW
for more than 1.14 ms, the internal clock stops, and the HC goes back into the
USBSuspend state.
XOSC_6MHz
(to DC PLL)
DC_EnableClock
On
HC PLL
Rev. 04 — 29 January 2009
PLL_ClkOut
PLL_Lock
HC_EnableClock
HC_RawClk48M
bit 11 (SuspendClkNotStop)
HC_ClkOk
USB single-chip host and device controller
H_Wakeup (pin)
HcHardware Configuration
SWITCH
DIGITAL
CLOCK
On
HC_Clk48MOut
HC_NeedClock
CS (pin)
ISP1161A1
© ST-NXP Wireless 2009. All rights reserved.
CORE
Figure
MGT958
HC
37.
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