HT82K95AE datasheet(20/43 Pages) HOLTEK

20 / 43 page

HT82K95EE/HT82K95AE

Rev. 1.50

April 13, 2012

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). If in USB mode

set this bit LVR OPT must disable

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:

To Configure the HT82K95EE/HT82K95AE as PS2

Device

The HT82K95EE/HT82K95AE can be configured as a

USB interface or PS2 interface device, by configuring

the SPS2 (bit 4 of USR) and SUSB (bit 5 of the USR). If

SPS2=1, and SUSB=0, the HT82K95EE/HT82K95AE is

configured as a PS2 interface, pin USBD- is configured

as a PS2 Data pin and USBD+ is configured as a PS2

Clk pin. User can easily read or write to the PS2 Data or

PS2 Clk pin by accessing the corresponding bit PS2DAI

(bit 4 of the USC), PS2CKI (bit 5 of the USC), PS2DAO

(bit 6 of the USC) and S2CKO (bit 7 of the USC) respec-

tively.

User should make sure that in order to read the data

properly, the corresponding output bit must be set to

²1².

For example, if it is desired to read the PS2 Data by

reading PS2DAI, the PS2DAO should set to

²1². Other-

wise it is always read as

²0².

If SPS2=0, and SUSB=1, the HT82K95EE/HT82K95AE

is configured as a USB interface. Both the USBD- and

USBD+ is driven by the SIE of the HT82K95E/

HT82K95A. User can only write or read the USB data

through the corresponding FIFO.

Both SPS2 and SUSB default is

²0².

USB Interface

There are ten registers, including PIPE_CTRL (41H in

bank 1), AWR (address + remote wake-up 42H in bank

1), STALL (43H in bank 1), PIPE (44H in bank 1), SIES

(45H in bank 1), MISC (46H in bank 1), Endpt_EN (47H

in bank 1), FIFO0 (48H in bank 1), FIFO1 (49H in bank

1), and FIFO2 (4AH in bank 1) used for the USB func-

tion. AWR register contains current address and a re-

mote wake up function control bit. The initial value of

AWR is

²00H². The address value extracted from the

USB command is not to be loaded into this register until

the SETUP stage is completed.

Bit No.

Label

R/W

Function

WKEN

Remote wake-up

enable/disable

7~1

AD6~AD0

USB device address

AWR (42H) Register

STALL and PIPE, PIPE_CTRL, Endpt_EN Registers

PIPE register represents whether the endpoint corre-

sponding is accessed by host or not. After ACT_EN sig-

nal being sent out, MCU can check which endpoint had

been accessed. This register is set only after the time

when host access the corresponding endpoint.

STALL register shows whether the endpoint corre-

sponding works or not. As soon as the endpoint work im-

properly, the bit corresponding must be set.

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

HT82K95AE 数据表(PDF) 20 Page - Holtek Semiconductor Inc

HT82K95AE 数据表(HTML) 20 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

数据表下载