mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 572

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Appendix A Electrical Characteristics
A.3.1.1
The release level V
if the device is powered externally. After releasing the POR reset the oscillator and the clock quality check
are started. If after a time t
clock. The fastest startup time possible is given by n
A.3.1.2
The release level V
if the device is powered externally. After releasing the LVR reset the oscillator and the clock quality check
are started. If after a time t
clock. The fastest startup time possible is given by n
A.3.1.3
Provided an appropriate external reset signal is applied to the MCU, preventing the CPU from executing
code when VDD5 is out of specification limits, the SRAM contents integrity is guaranteed if after the reset
the PORF bit in the CRG Flags Register has not been set.
A.3.1.4
When external reset is asserted for a time greater than PW
reset, and the CPU starts fetching the reset vector without doing a clock quality check, if there was an
oscillation before reset.
A.3.1.5
Out of STOP the controller can be woken up by an external interrupt. A clock quality check as after POR
is performed before releasing the clocks to the system.
A.3.1.6
The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in
both modes. The controller can be woken up by internal or external interrupts. After t
fetching the interrupt vector.
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POR
LVR
SRAM Data Retention
External Reset
Stop Recovery
Pseudo Stop and Wait Recovery
PORR
LVRR
and the assert level V
and the assert level V
CQOUT
CQOUT
no valid oscillation is detected, the MCU will start using the internal self
no valid oscillation is detected, the MCU will start using the internal self
MC9S12E256 Data Sheet, Rev. 1.08
PORA
LVRA
are derived from the V
are derived from the V
uposc
uposc
.
.
RSTL
the CRG module generates an internal
DD
DD
Supply. They are also valid
Supply. They are also valid
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wrs
the CPU starts