XC68HC705JB3 Motorola, XC68HC705JB3 Datasheet - Page 87

• Manufacturer Part Number: XC68HC705JB3
• Description: MICROCONTROLLER
• Manufacturer: Motorola

10.5.1 USB Address Register (UADDR)
10.5.2 USB Interrupt Register 0 (UIR0)
MC68HC05JB3
REV 1
USBEN — USB Module Enable
UADD6-UADD0 — USB Function Address
TXD0F — Endpoint 0 Data Transmit Flag
RXD0F — Endpoint 0 Data Receive Flag
UADDR
$0038
UIR0
$0039
This read/write bit enables and disables the USB module and the USB pins.
When USBEN is clear, the USB module will not respond to any tokens. Reset
clears this bit.
These bits specify the USB address of the device. Reset clears these bits.
This read only bit is set after the data stored in Endpoint 0 transmit buffers has
been sent and an ACK handshake packet from the host is received. Once the
next set of data is ready in the transmit buffers, software must clear this flag by
writing a logic 1 to the TXD0FR bit. To enable the next data packet transmis-
sion, TX0E must also be set. If TXD0F bit is not cleared, a NAK handshake will
be returned in the next IN transaction.
Reset clears this bit. Writing a logic 0 to TXD0F has no effect.
This read only bit is set after the USB module has received a data packet and
responded with an ACK handshake packet. Software must clear this flag by
writing a logic 1 to the RXD0FR bit after all of the received data has been read.
reset:
reset:
1 = USB function enabled.
0 = USB function disabled.
1 = Transmit on Endpoint 0 has occurred.
0 = Transmit on Endpoint 0 has not occurred.
W
W
R
R
USBEN
TXD0F
BIT 7
BIT 7
0
0
Figure 10-20. USB Address Register (UADDR)
Figure 10-21. USB Interrupt Register 0 (UIR0)
= Unimplemented
UADD6
RXD0F
UNIVERSAL SERIAL BUS MODULE
BIT 6
BIT 6
0
0
November 5, 1998
UADD5
RSTF
BIT 5
BIT 5
0
0
SUSPND
UADD4
BIT 4
BIT 4
0
0
UADD3
TXD0IE
GENERAL RELEASE SPECIFICATION
BIT 3
BIT 3
0
0
UADD2
RXD0IE
BIT 2
BIT 2
0
0
TXD0FR
UADD1
BIT 1
BIT 1
0
0
0
MOTOROLA
RXD0FR
UADD0
BIT 0
BIT 0
0
0
0
10-19