mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 129

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

9.5.2 Reset Signaling
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
The width of the SE0 in the EOP is about two bit times. The EOP width
is measured with the same capacitive load used for maximum rise and
fall times and is measured at the same level as the differential signal
crossover points of the data lines.
The USB module will detect a reset signaled on the bus by the presence
of an extended SE0 at the USB data pins of a device. The MCU seeing
a single-ended 0 on its USB data inputs for more than 8 s treats that
signal as a reset.
A USB sourced reset will hold the MCU in reset for the duration of the
reset on the USB bus. The USB bit in the reset status register (RSR) will
be set after the internal reset is removed. Refer to
Register
detailed in
t
V
V
V
V
Period
OH
SE
SE
OL
DIFFERENTIAL
DATA LINES
(min.)
(max)
(min.)
(min.)
V
SS
Universal Serial Bus Module (USB)
for more detail. The MCU’s reset recovery sequence is
Section 8. System Integration Module
Figure 9-7. EOP Transaction Voltage Levels
Figure 9-8. EOP Width Timing
LAST BIT OF
PACKET
Universal Serial Bus Module (USB)
CROSSOVER
WIDTH
LEVEL
EOP
STROBE
DATA
EOP
8.8.2 Reset Status
(SIM).
Functional Description
BUS DRIVEN TO
IDLE STATE
Technical Data
BUS FLOATS
BUS IDLE
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