參數資料
型號: MC68HC705JB2P
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數: 119/128頁
文件大?。?/td> 2493K
代理商: MC68HC705JB2P
GENERAL RELEASE SPECIFICATION
August 28, 1998
UNIVERSAL SERIAL BUS MODULE
MC68HC705JB2
10-22
REV 1.1
EOPFR — End of Packet Flag Reset
Writing a logic 1 to this write only bit will clear the EOPF bit if it is set. Writing a
logic 0 to the EOPFR has no effect. Reset clears this bit.
10.5.4 USB Control Register 0 (UCR0)
T0SEQ — Endpoint 0 Transmit Sequence Bit
This read/write bit determines which type of data packet (DATA0 or DATA1) will
be sent during the next IN transaction. Toggling of this bit must be controlled by
software. Reset clears this bit.
1 =
DATA1 Token active for next Endpoint 0 transmit
0 =
DATA0 Token active for next Endpoint 0 transmit
STALL0 — Endpoint 0 Force Stall Bit
This read/write bit causes Endpoint 0 to return a STALL handshake when
polled by either an IN or OUT token by the USB Host Controller. The USB
hardware clears this bit when a SETUP token is received. Reset clears this bit.
1 =
Send STALL handshake
0 =
Default
TX0E — Endpoint 0 Transmit Enable
This read/write bit enables a transmit to occur when the USB Host controller
sends an IN token to Endpoint 0. Software should set this bit when data is
ready to be transmitted. It must be cleared by software when no more Endpoint
0 data needs to be transmitted.
If this bit is 0 or the TXD0F is set, the USB will respond with a NAK handshake
to any Endpoint 0 IN tokens. Reset clears this bit.
1 =
Data is ready to be sent.
0 =
Data is not ready. Respond with NAK.
RX0E — Endpoint 0 Receive Enable
This read/write bit enables a receive to occur when the USB Host controller
sends an OUT token to Endpoint 0. Software should set this bit when data is
ready to be received. It must be cleared by software when data cannot be
received.
If this bit is 0 or the RXD0F is set, the USB will respond with a NAK handshake
to any Endpoint 0 OUT tokens. Reset clears this bit.
1 =
Data is ready to be received.
0 =
Not ready for data. Respond with NAK.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
UCR0
R
T0SEQ
STALL0
TX0E
RX0E
TP0SIZ3 TP0SIZ2 TP0SIZ1 TP0SIZ0
$003B
W
reset
00000000
Figure 10-23. USB Control Register 0 (UCR0)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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