MSE908JB8 FREESCALE [Freescale Semiconductor, Inc], MSE908JB8 Datasheet - Page 2

• Manufacturer Part Number: MSE908JB8
• Description: Mask Set Errata
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Workaround
When the USB module is enabled and a USB reset is detected, either an internal reset or an interrupt to
the CPU can be generated. Which one is generated depends on the RSTD bit of CONFIG.
Configuring the USB reset to generate a USB interrupt request to the CPU by setting the RSTD bit of
CONFIG fixes this problem. When a USB reset is detected in the interrupt routines, you have two choices:
Example code to implement an illegal opcode:
USB_ISR:
No_USB_Reset
Power-Up from LVR
Description
A few devices start abnormally during power-up. The issue is the release of the low voltage reset (LVR)
earlier than the V
The LVR takes the V
threshold voltage (V
rises slowly. If the LVR has been released but the V
the LVR does not have any effect. This might cause the internal logic to improperly initialize and the MCU
might not start normally.
Therefore, the V
reaches the CMOS logic operating voltage.
Workaround
To fix the problem, add a 10 Ω series resistor between the power supply and the V
capacitor at the V
2
•
•
brclr b_RSTF,UIR1,No_USB_Reset ;check USB reset
db
Reconfigure the USB module and other related registers
Use software to cause a device reset, for example, illegal opcode
$32
DD
REG
DD
voltage must be lower than the VLVR minimum (2.8 V) when the V
LVR
DD
pin and a 4.7 µF capacitor at the V
reaching the CMOS logic operating voltage (typical 0.65 V).
). The problem happens in few devices when the V
but not the V
Mask Set Errata for 908JB8, Mask 3K45H
REG
;illegal opcode
as a reference. LVR exists until the V
REG
doesn’t reach the CMOS logic operating voltage,
REG
pin.
DD
rises quickly and the V
DD
DD
reaches the LVR
Freescale Semiconductor
, and place a 10 µF
REG
voltage
SE115-Power
REG