ht82m9be Holtek Semiconductor Inc., ht82m9be Datasheet - Page 20

• Manufacturer Part Number: ht82m9be
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

There are some timing constrains and usages illustrated here. By setting the MISC register, the MCU can perform read-
ing, writing and clearing actions. There are some examples shown in the following table for endpoint FIFO reading, writ-
ing and clearing.
Note: *: There are 2 s gap existing between 2 reading actions or between 2 writing actions
USB Active Pipe Timing
The USB active pipe accessed by the host cannot be used by the MCU simultaneously. When the host finishes its work,
the signal, a USB_INT will be produced to tell the MCU that the pipe can be used and the acted pipe No. will be shown
in the signal, ACT_PIPE as well. The timing is illustrated in the figure below.
Suspend Wake-Up and Remote Wake-Up
If there is no signal on the USB bus for over 3ms, the
HT82M9BE/HT82M9BA will go into a suspend mode.
The Suspend line (bit 0 of the USC) will be set to 1 and a
USB interrupt is triggered to indicate that the
HT82M9BE/HT82M9BA should jump to the suspend
state to meet the 500 A USB suspend current spec.
In order to meet the 500 A suspend current, the pro-
grammer should disable the USB clock by clearing the
USBCKEN (bit3 of the SCC) to 0 . The suspend cur-
rent is 400 A.
When the resume signal is sent out by the host, the
HT82M9BE/HT82M9BA will wake-up the MCU by USB
interrupt and the Resume line (bit 3 of the USC) is set. In
order to make the HT82M9BE/HT82M9BA function
properly, the programmer must set the USBCKEN (bit 3
of the SCC) to 1 and clear the SUSP2 (bit4 of the SCC).
Since the Resume signal will be cleared before the Idle
Rev. 1.60
Read FIFO0 sequence
Write FIFO1 sequence
Check whether FIFO0 can be read or not
Check whether FIFO1 can be written to or not
Write 0-sized packet sequence to FIFO 0
Register Name
FIFO0
FIFO1
FIFO2
FIFO3
Actions
R/W
R/W
R/W
R/W
R/W
FIFO Register Address Table
USB Active Pipe Timing
00H 01H delay of 2 s, check 41H read* from FIFO0 register
and check if not ready (01H) 03H 02H
0AH 0BH delay of 2 s, check 4BH write* to FIFO1 register and
check if not ready (0BH) 09H 08H
00H 01H delay of 2 s, check 41H (if ready) or 01H (if not ready)
0AH 0BH delay of 2 s, check 4BH (if ready) or 0BH (if not ready)
02H 03H delay of 2 s, check 43H 01H 00H
00H
0AH
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signal is sent out by the host and the Suspend line (bit 0
of the USC) is going to 0 . So when the MCU is detect-
ing the Suspend line (bit0 of the USC), the Resume line
should be remembered and taken into consideration.
After finishing the resume signal, the suspend line will
go inactive and a USB interrupt is triggered. The follow-
ing is the timing diagram:
The device with remote wake-up function can wake-up
the USB Host by sending a wake-up pulse through
RMWK (bit 1 of USC). Once the USB Host receive the
wake-up signal from the HT82M9BE/HT82M9BA, it will
Register Address
MISC Setting Flow and Status
01001000B
01001001B
01001010B
01001011B
HT82M9BE/HT82M9BA
Data7~Data0
Data7~Data0
Data7~Data0
Data7~Data0
Bit7~Bit0
April 16, 2008