MC908JB16DWE Datasheet, PDF (185/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
11.8.3 USB Interrupt Register 1
Address: $003A
Bit 7
6
5
4
3
2
1
Read: EOPF
Write:
RSTF TXD2F RXD2F TXD1F RESUMF TXD0F
Reset: 0
0
0
0
0
0
0
= Unimplemented
Figure 11-17. USB Interrupt Register 1 (UIR1)
Bit 0
RXD0F
0
EOPF — End-of-Packet Detect Flag
This read-only bit is set when a valid end-of-packet sequence is
detected on the D+ and D– lines. Software must clear this flag by
writing a logic 1 to the EOPFR bit.
Reset clears this bit. Writing to EOPF has no effect.
1 = End-of-packet sequence has been detected
0 = End-of-packet sequence has not been detected
RSTF — USB Reset Flag
This read-only bit is set when a valid reset signal state is detected on
the D+ and D– lines. If the URSTD bit of the configuration register
(CONFIG) is clear, this reset detection will generate an internal reset
signal to reset the CPU and other peripherals including the USB
module. If the URSTD bit is set, this reset detection will generate an
USB interrupt. This bit is cleared by writing a logic 1 to the RSTFR bit.
This bit also is cleared by a POR reset.
NOTE: The USB bit in the SRSR (see 8.8.2 SIM Reset Status Register
(SRSR)) is also a USB reset indicator.
TXD2F — Endpoint 2 Data Transmit Flag
This read-only bit is set after the data stored in endpoint 2 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 TXD2FR bit.
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor
Universal Serial Bus Module (USB)
Technical Data
185