MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 689

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

19.9.2 FLASH Program/Erase Voltage Conditioning
MPC555
USER’S MANUAL
CMF_EPEE
If EPEE = 1 when EHV is asserted, high voltage operations such as program or erase
are enabled. If EPEE = 0 when EHV is asserted, high voltage operations are disabled.
The EPEE pin uses a two-period clock synchronizer that switches the internal signal
CMF_EPEE after two consecutive constant values of EPEE, as shown in
8. At first the value of CMF_EPEE is unknown, as the prior information for the EPEE
pin is not provided. One high or low clock of EPEE does not cause CMF_EPEE to
switch.
A voltage of at least (VDDL – 0.35 V) must be applied at all times to the VPP pins or
damage to the FLASH module can occur. FLASH modules can be damaged by power
on and power off VPP transients. VPP must not rise to programming level while VDDL
is below 1.0 volts, and must not fall below the minimum specified value while VDDL is
applied.
EPEE
Clock
/
MPC556
Figure 19-9
Figure 19-8 CMF_EPEE Timing Diagram
shows the VPP and VDDL operating envelope.
CDR MoneT FLASH EEPROM
Rev. 15 October 2000
Figure 19-
MOTOROLA
19-37