ht82k95ee Holtek Semiconductor Inc., ht82k95ee Datasheet - Page 21

• Manufacturer Part Number: ht82k95ee
• Description: Ht82k95ee/ht82k95ae -- Usb Multimedia Keyboard Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

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) respectively.
User should make sure that in order to read the data properly, the corresponding output bit must be set to 1 . For ex-
ample, if it is desired to read the PS2 Data by reading PS2DAI, the PS2DAO should set to 1 . Otherwise it is always
read as 0 .
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 HT82K95EE/ HT82K95AE. User can only write or read the USB data through the corre-
sponding FIFO.
Both SPS2 and SUSB default is 0 .
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 function. AWR register
contains current address and a remote wake up function control bit. The initial value of AWR is 00H . The address
value extracted from the USB command is not to be loaded into this register until the SETUP stage is completed.
STALL and PIPE, PIPE_CTRL, 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 endpoint0) using data
toggles to the value DATA0. Once the user want the any endpoint (except endpoint0) 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 :
Rev. 1.20
PIPE_CTRL
STALL
PIPE
Endpt_EN
Bit No.
Register
7~1
Name
0
AD6~AD0
WKEN
Label
PIPE_CTRL (41H), STALL (43H), PIPE (44H) and Endpt_EN (47H) Registers
R/W
R/W
R/W
R/W
R
R/W
W
W
01000001B
01000011B
01000100B
01000001B
Register
Address
Remote wake-up enable/disable
USB device address
Bit7~Bit3 Reserved
AWR (42H) Register
21
Function
Pipe 2
Pipe 2
Pipe 2
Pipe 2
Bit 2
HT82K95EE/HT82K95AE
Pipe 1
Pipe 1
Pipe 1
Pipe 1
Bit 1
Pipe 0
Pipe 0
Pipe 0
Pipe 0
Bit 0
August 28, 2006
00000111
00000111
00000000
00000111
Default
Value