MC68HC908LD64 Datasheet, PDF (216/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
It must be cleared by software when no more data needs to be
transmitted. If this bit is 0 or the TXD1F is set, the USB will respond
with a NAK handshake to any endpoint 1 or endpoint 2 directed IN
tokens. Reset clears this bit.
1 = Data is ready to be sent.
0 = Data is not ready; respond with NAK.
TP1SIZ[3:0] — Embedded Device Endpoint 1/2 Transmit Data Packet Size
These read/write bits store the number of transmit data bytes for the
next IN token request for embedded device endpoint 1 or endpoint 2.
These bits are cleared by reset.
14.7.6 USB Embedded Device Control Register 2 (DCR2)
Address: $0047
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
ENABLE2 ENABLE1 DSTALL2 DSTALL1
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 14-18. USB Embedded Device Control Register 2 (DCR2)
ENABLE2 — Embedded Device Endpoint 2 Enable
This read/write bit enables embedded device endpoint 2 and allows
the USB to respond to IN packets addressed to this endpoint. Reset
clears this bit.
1 = Embedded device endpoint 2 is enabled and can respond to an
IN token
0 = Embedded device endpoint 2 is disabled
ENABLE1 — Embedded Device Endpoint 1 Enable
This read/write bit enables embedded device endpoint 1 and allows
the USB to respond to IN packets addressed to this endpoint. Reset
clears this bit.
1 = Embedded device endpoint 1 is enabled and can respond to an
IN token
0 = Embedded device endpoint 1 is disabled
Data Sheet
216
Universal Serial Bus Module (USB)
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor