HT82K96E datasheet(19/46 Pages) HOLTEK

19 / 46 page

HT82K96E

Rev. 1.70

April 22, 2004

Suspend Wake-Up Remote Wake-Up

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

HT82K96E will go into suspend mode . The Suspend

line (bit 0 of USC) will be set to 1 and a USB interrupt is

triggered to indicate the HT82K96E should jump to sus-

pend 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 clear the

USBCKEN (bit3 of the SCC) to

²0². The suspend cur-

rent is about 400

mA.

Also the user can further decrease the suspend current

to 250

mA by set the SUSP2 (bit4 of the SCC). But if the

SUSP2 is set, the user make sure cannot enable the

LVR OPT option, otherwise the HT82K96E will be reset.

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

HT82K96E will wake up the MCU by USB interrupt and

the Resume line (bit 3 of USC) is set. In order to make

HT82K96E work properly, the firmware must set the

USBCKEN (bit 3 of SCC) to 1 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 and the Sus-

pend line (bit 0 of USC) is going to

²0². So when the

MCU is detecting the Suspend line (bit0 of USC), the

Resume line should be remembered and token into con-

sideration.

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 USC). Once the USB Host receive the

wake-up signal from HT82K96E. it will send a Resume

signal to device. The timing as follow:

To Configure the HT82K96E as PS2 Device

The HT82K96E can be define as USB interface or PS2

interface by configuring the SPS2 (bit 4 of USR) and

SUSB (bit 5 of USR). If SPS2=1, and SUSB=0, the

HT82K96E is defined as PS2 interface, pin USBD- is

now defined as PS2 Data pin and USBD+ is now de-

fined as PS2 Clk pin. The user can easy to read or write

the PS2 Data or PS2 Clk pin by accessing the corre-

sponding bit PS2DAI (bit 4 of USC), PS2CKI (bit 5 of

USC), PS2DAO (bit 6 of USC) and S2CKO (bit 7 of

USC) respectively.

The user should make sure that in order to read the data

properly, the corresponding output bit must set to 1. For

example, if it want to read PS2 Data by reading PS2DAI,

the PS2DAO should set to 1. Otherwise it always read 0.

If SPS2=0, and SUSB=1, the HT82K96E is defined as

USB interface. Both the USBD- and USBD+ is driving by

SIE of the HT82K96E. The user only write or read the

USB data through the corresponding FIFO.

Both SPS2 and SUSB is default

²0².

To Configure the ADC Block

The HT82K96E has built-in a 8-bit A/D converter with 6

channels (PB0~PB5). In order to make the A/D con-

verter more flexibility, there are two mode: External Ref-

erence voltage and Internal Reference voltage. It can

easy to configure by setting the ADREF (bit 6 of USR).

For External Reference voltage, the reference voltage

of the A/D converter comes from external PB6/VRL and

PB7/VRH pins. Otherwise, the reference voltage is

coming from the VDD and VSS of MCU.

PB0~PB5 is the 6-channels input of the A/D converter, it

can easy to define which channel is converting by con-

figuring ACS2~ACS0 (bit 2~0 of ADSC). Also there are

four converter clock source to be selected by setting

ADCS1 (bit 4 of ADSC), ADCS0 ( bit 3 of ADSC).

Once the ADON (bit 6 of ADSC) is set and send the start

pulse through START (bit 5 of ADSC). The A/D con-

verter will be in operation. There are EOCB (bit 7 of

ADSC) to indicate whether the A/D converter is busy or

not. The EOCB is clear when the conversion is com-

pleted. The user can read the converter data by reading

the register ADR. In order to meet 500uA suspend cur-

rent spec. . The user should disable the A/D by clearing

ADON before jump to suspend mode.

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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