mc68hc908ld64 Freescale Semiconductor, Inc, mc68hc908ld64 Datasheet - Page 200

• Manufacturer Part Number: mc68hc908ld64
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Universal Serial Bus Module (USB)
14.6.4 USB SIE Timing Status Register (SIETSR)
Data Sheet
200
* RSTF is reset by a power-on reset (POR) only.
Address:
RSTF — USB Reset Flag
RSTFR — Clear Reset Flag Bit
LOCKF — USB Frame Timer Locked
LOCKFR — Clear Frame Timer Locked Flag
Reset:
Read:
Write:
This read-only bit is set when a valid USB reset signal state is
detected on the D0+ and D0– lines. This bit is cleared by writing a
logic 1 to the RSTFR bit or by a MCU power-on reset.
Writing a logic 1 to this write-only bit will clear the RSTF bit if it is set.
Reset clears this bit.
This read-only bit is set when the internal frame timer is locked to the
host timer. This bit is cleared by writing a logic 1 to the LOCKFR bit.
Reset clears this bit.
Writing a logic 1 to this write-only bit will clear the LOCKF bit if it is set.
Reset clears this bit.
1 = USB reset signal detected on D0+ and D0–
0 = No USB reset detected
1 = Write 1 to clear the RSTF bit
0 = No effect
1 = Internal frame timer is locked to the host timer
0 = Internal frame timer is not locked to the host timer
1 = Write 1 to clear the LOCKF bit
0 = No effect
Figure 14-6. USB SIE Timing Status Register (SIETSR)
$0057
RSTF
Bit 7
Universal Serial Bus Module (USB)
0*
= Unimplemented
RSTFR
6
0
0
LOCKF
5
0
LOCKFR
4
0
0
SOFFR
3
0
0
MC68HC908LD64
EOF2FR
Freescale Semiconductor
2
0
0
EOPFR
1
0
0
—
TRANFR
Rev. 3.0
Bit 0
0
0