SH79F6488PSLASH080PR datasheet(113/152 Pages) SINOWEALTH

113 / 152 page

SH79F6488/SH79F6489

113

NAK

Endpoint write byte 0

Endpoint write byte 1

Endpoint write byte 2

Endpoint write byte n

IEPnIF=0;OEPnRDY=1

NAK

IEPnIF=1;IEPnRDY=0

Host

USB SIE

8051 CPU

ACK

DATA0(nbytes)

Endpoint write byte 0

USB Bulk/Interrupt Transfer (IN transaction) Flow

8.9.3 Suspend/Resume Control

When the USB controller detected suspend signal, the SUSPIF will be setted by hardware, the USB interrupt will be generated,

if the USB interrupt has been enable. The device must be setted to suspend state by software in 7ms (Set GOSUSP bit in

USBCON register). To reduce power consumption maximumly, the software may close high frequency clock by following the

steps below.

When code option OP_OSC = 1010 or 1101:

(1) Set GOSUSP bit in USBCON register

(2) Clear FS bit in CLKCON register (32.768kHz oscillator is selected as OSCSCLK)

(3) Clear PLLFS bit in PLLCON register

(4) Clear PLLON bit in PLLCON register (Close PLL)

(5) Clear OSC2ON bit in CLKCON register (Close OSC2)

(6) Set EUSB bit in IEN1 register. Set EA bit in IEN0 register. Set PUPIE, RESMIE, PBRSTIE bits in USBIE1 register

(7) Make CPU entering Idle mode to reduce power consumption

When code option OP_OSC = 0000:

(1) Set GOSUSP bit in USBCON register

(2) Clear FS bit in CLKCON register (Internal 12MHz RC oscillator is selected as OSCSCLK)

(3) Clear PLLFS bit in PLLCON register

(4) Clear PLLON bit in PLLCON register (Close PLL)

(5) Clear OSC2ON bit in CLKCON register (Close OSC2)

(6) Set EUSB bit in IEN1 register. Set EA bit in IEN0 register. Set PUPIE, RESMIE, PBRSTIE bits in USBIE1 register

(7) Make CPU entering Power-down mode to reduce power consumption

When the USB controller detected the following three USB states below in suspend state, the interrupt will be generated, if the

related interrupt has been enable.

(1) Detected Resume Command

(2) Detected BUS RESET Command

(3) Detected Plug/Unplug

If CPU is in Power-down/Idle mode, theCPU will be waked, and entering the related interrupt. The software may open high

frequency clock refer to 7.5 System Clock and Oscillator section in sequence. And then clear GOSUSP.

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