MC68HC908JG16 Datasheet, PDF (189/324 Pages) Motorola, Inc – Microcontrollers

Universal Serial Bus Module (USB)
I/O Registers
If this bit is 0 or the TXD1F is set, the USB will respond with a NAK
handshake to any endpoint 1 directed IN tokens. Reset clears this bit.
1 = Data is ready to be sent
0 = Data is not ready. Respond with NAK
FRESUM — Force Resume
This read/write bit forces a resume state (K or non-idle state) onto the
USB data lines to initiate a remote wakeup. Software should control
the timing of the forced resume to be between 10 and 15 ms. Setting
this bit will not cause the RESUMF bit to be set.
1 = Force data lines to K state
0 = Default
TP1SIZ3–TP1SIZ0 — Endpoint 1 Transmit Data Packet Size
These read/write bits store the number of transmit data bytes for the
next IN token request for endpoint 1. These bits are cleared by reset.
11.8.7 USB Control Register 2
Address: $0019
Bit 7
Read:
T2SEQ
Write:
6
STALL2
5
TX2E
4
3
2
1
Bit 0
RX2E TP2SIZ3 TP2SIZ2 TP2SIZ1 TP2SIZ0
Reset: 0
0
0
0
0
0
0
0
Figure 11-21. USB Control Register 2 (UCR2)
T2SEQ — Endpoint 2 Transmit Sequence Bit
This read/write bit determines which type of data packet (DATA0 or
DATA1) will be sent during the next IN transaction directed to
endpoint 2. Toggling of this bit must be controlled by software. Reset
clears this bit.
1 = DATA1 token active for next endpoint 2 transmit
0 = DATA0 token active for next endpoint 2 transmit
MC68HC908JG16 — Rev. 1.1
Freescale Semiconductor
Universal Serial Bus Module (USB)
Technical Data
189