HT82K95EE datasheet(20/45 Pages) HOLTEK

20 / 45 page

Data EEPROM Timing Diagrams

Note:

The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the valid start

condition of sequential command.

HT82K95EE/HT82K95AE

Rev. 1.20

August 28, 2006

t f

t L O W

t r

t H I G H

t S U : S T A

t H D : S T A

t S P

t H D : D A T

t S U : D A T

t S U : S T O

t B U F

V a l i d

S C L

S D A

O U T

t A A

t W R

S C L

S D A

8 t h b i t

A C K

W o r d n

S t o p

C o n d i t i o n

S t a r t

C o n d i t i o n

Suspend Wake-Up and Remote Wake-Up

If there is no signal on the USB bus for over 3ms, the

HT82K95EE/HT82K95AE will go into suspend mode.

The Suspend line (bit 0 of the USC) will be set to

²1² and

a USB interrupt is triggered to indicate that the

HT82K95EE/HT82K95AE should jump to the suspend

state to meet the 500

mA USB suspend current spec.

In order to meet the 500

mA suspend current, the firm-

ware should disable the USB clock by clearing the

USBCKEN (bit3 of the SCC) to

²0². The suspend cur-

rent is 400

mA.

User can further decrease the suspend current to 250

by setting the SUSP2 (bit4 of the SCC). But if the

SUSP2 is set, user should make sure not to enable the

LVR OPT option, otherwise the HT82K95EE/

HT82K95AE will be reset.

When the resume signal is sent out by the host, the

HT82K95EE/HT82K95AE will wake-up the MCU by

USB interrupt and the Resume line (bit 3 of the USC) is

set. In order to make the HT82K95EE/HT82K95AE

function properly, the firmware must set the USBCKEN

(bit 3 of the SCC) to

²1² and clear the SUSP2 (bit4 of the

SCC). Since the Resume signal will be cleared before

the Idle signal is sent out by the host, the Suspend line

(bit 0 of the USC) will be set to

²0². So when the MCU is

detecting the Suspend line (bit0 of USC), the Resume

line should be remembered and taken into consider-

ation.

After finishing the resume signal, the suspend line will

go inactive and a USB interrupt is triggered. The follow-

ing is the timing diagram.

The device with remote wake up function can wake up

the USB Host by sending a wake-up pulse through

RMWK (bit 1 of the USC). Once the USB Host receives

a wake-up signal from the HT82K95EE/HT82K95AE, it

will send a Resume signal to the device. The timing is as

follows:

S U S P E N D

U S B R e s u m e S i g n a l

U S B _ I N T

S U S P E N D

U S B R e s u m e S i g n a l

U S B _ I N T

R M W K

M i n . 2 . 5 m s

M i n . 1 U S B C L K

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