ht82m99e Holtek Semiconductor Inc., ht82m99e Datasheet - Page 22

• Manufacturer Part Number: ht82m99e
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

USB/PS2 Status and Control Register USC (Address 0X1A)
Endpoint Interrupt Status Register USR (Address 0X1B)
The USR (USB endpoint interrupt status register) register is used to indicate which endpoint is accessed and to select
the serial bus (PS2 or USB). The endpoint request flags (EP0IF, EP1IF) are used to indicate which endpoints are ac-
cessed. If an endpoint is accessed, the related endpoint request flag will be set to 1 and a USB interrupt will occur (If a
USB interrupt is enabled and the stack is not full). When the active endpoint request flag is served, the endpoint request
flag has to be cleared to 0 .
Rev. 2.20
Register Bits
Register Bits
(0X1A)
(0X1B)
Port-B Control (15H)
This port configures the input or output mode of Port-B for I/O mode
USC
USR
2~3 PEC2~PEC3
0
1
2
3
4
5
6
7
0
1
4
5
6
7
Labels
Labels
PEC0
PEC1
PEC4
PEC5
PEC6
PEC7
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PBC
Read/Write
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
W
W
R
R
R
R
URST_FLAG USB bus reset event flag. Default value is 0.
RESUME_O
RMOT_WK USB remote wake-up signal. Default value is 0.
SUSPEND
PS2_DAO
PS2_CKO
PS2_DAI
PS2_CKI
USB_flag
SELUSB
SELPS2
Option
Option
EP0IF
EP1IF
22
USB suspend mode status bit. When 1, indicates that
the USB system entry is in suspend mode.
When RESUME_OUT EVENT, RESUME_O is set to 1.
Default value is 0.
USBD-/DATA input
USBD+/CLK input
Output for driving USBD-/DATA pin, when working un-
der 3D PS2 mouse function. Default value is 1.
Output for driving USBD-/DATA pin, when working un-
der 3D PS2 mouse function. Default value is 1.
When set to 1 , indicates an endpoint 0 interrupt event.
Must wait for the MCU to process the interrupt event and
clear this bit by firmware. This bit must be 0 , then the
next interrupt event will be processed. Default value is
When set to 1 , indicates an endpoint 1 interrupt event.
Must wait for the MCU to process the interrupt event,
then clear this bit by firmware. This bit must be 0 , then
the next interrupt event will be processed. Default value
is 0 .
Reserved bit, set to 0
When set to 1 , indicates that the chip is working under
PS2 mode. Default value is 0 .
When set to 1 , indicates that the chip is working under
USB mode. Default value is 0.
Reserved bit, set to 0
This flag is used to show that the MCU is in USB mode
(Bit=1). This bit is R/W by FW and will be cleared to zero
after power-on reset. The default is 0 .
0 .
HT82M99E/HT82M99A
Functions
Functions
April 16, 2008