HT82B42R datasheet(56/86 Pages) HOLTEK

56 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

TheMCUcancommunicatewiththeendpointFIFObysettingthecorrespondingregisters,of

whichtheaddressislistedinthefollowingtable.Afterreadingthecurrentdata,thenextdatawill

showafter2μs,thisisusedtochecktheendpointFIFOstatusandresponsetotheMISCregister,if

read/writeactionisstillgoingon.

Registers

R/W

Bank

Address

Bit7~Bit0

FIFO0

R/W

48H

Data7~Data0

FIFO1

R/W

49H

Data7~Data0

FIFO2

R/W

4AH

Data7~Data0

Therearesometimingconstrainsandusagesillustratedhere.BysettingtheMISCregister,theMCU

canperformreading,writingandclearingactions.Therearesomeexamplesshowninthefollowing

tableforendpoinFIFOreading,writingandclearing.

Actions

MISC Setting Flow and Status

Read FIFO0 sequence

00H→01H→delay 2μs, check 41H→read* from FIFO0

Write FIFO1 sequence

0AH→0BH→delay 2μs, check 4BH→write* to FIFO1

Check whether FIFO0 can be read or not

00H→01H→delay 2μs, check 41H (read) or 01H

(not ready) →00H

Check whether FIFO1 can be written or not 0AH→0BH→delay 2μs, check 4BH (read) or 0BH

(not ready) →0AH

Read 0-sized packet sequence from FIFO0 00H→01H→delay 2μs, check 81H→read once

(01H)→03H→S02H

Write 0-sized packet sequence to FIFO1

0AH→0BH→delay 2μs, check 4BH→09H→08H

Note:*:Thereisa2μstimebetween2readactionsorbetween2writeactions.

HT82B42R Datasheet(PDF) 56 Page - Holtek Semiconductor Inc

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