HT82M9BE/HT82M9BA

Rev. 1.80

17

December 22, 2008

USB with MCU Interface

There are eight registers, including Pipe_ctrl, Address+Remote_WakeUp, STALL, SIES, MISC, Endpt_EN and

FIFO0~FIFO3 in this buffer function.

Register

Name

Pipe_ctrl

Addr.+

Remote

STALL

SIES

MISC

Endpt_EN FIFO0

FIFO1

FIFO2

FIFO3

Mem. Addr.

41H

42H

43H

45H

46H

47H

48H

49H

4AH

4BH

Register Memory Mapping

Address+Remote_WakeUp register represents current address and remote wake-up function. The initial value is

²00000000² from MSB to LSB.

Register

Address

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

01000010B

R/W

Address value

Default value=00000000

Remote Wake-up Function

0: Not this function

1: The function exists

Address+Remote_WakeUp Register

STALL, Pipe_ctrl and Endpt_EN Registers

PIPE register represents whether the endpoint corresponding is accessed by host or not. After ACT_EN signal 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 corresponding works or not. As soon as the endpoint work improperly, the

bit corresponding must be set.

Pipe_ctrl register is used for configuring IN (Bit=1) or OUT (Bit=0) pipe. The default is define IN pipe. Where Bit0

(DATA0) of the Pipe_ctrl register is used to setting the data toggle of any endpoint (except endpoint 0) using data tog-

gles to the value DATA0. Once the user want the any endpoint (except endpoint 0) using data toggles to the value

DATA0, the user can output a LOW pulse to this bit. The LOW pulse period must at least 10 instruction cycle.

Endpt_EN register is used to enable or disable the corresponding endpoint (except endpoint 0). Enable Endpoint

(Bit=1) or disable Endpoint (Bit=0).

The bitmaps are list as follows:

Register

Name

R/W

Register

Address

Bit7~Bit4

Reserved

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

Pipe_ctrl

R/W

01000001B

¾

Pipe 3

Pipe 2

Pipe 1

Data 0

0000 1110

STALL

R/W

01000011B

¾

Pipe 3

Pipe 2

Pipe 1

Pipe 0

0000 1110

Endpt_EN

R/W

01000111B

¾

Pipe 3

Pipe 2

Pipe 1

Pipe 0

0000 1111

Pipe_ctrl (41H), STALL (43H) and Endpt_EN (47H) Registers