ht82k95e Holtek Semiconductor Inc., ht82k95e Datasheet - Page 18

• Manufacturer Part Number: ht82k95e
• Description: Ht82k95e/ht82k95a -- Usb Multimedia Keyboard Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

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 HT82K95E/HT82K95A, it will
send a Resume signal to the device. The timing is as fol-
lows:
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)
Rev. 2.00
Bit No.
7~1
0
AD6~AD0
WKEN
Label
R/W
W
W
Remote wake-up enable/disable
USB device address
AWR (42H) Register
18
To Configure the HT82K95E/HT82K95A as PS2 De-
vice
The HT82K95E/HT82K95A 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 HT82K95E/HT82K95A 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 1 .
For example, if it is desired to read the PS2 Data by
reading PS2DAI, the PS2DAO should set to 1 . Other-
wise it is always read as 0 .
If SPS2=0, and SUSB=1, the HT82K95E/HT82K95A 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 0 .
Function
HT82K95E/HT82K95A
April 16, 2008