MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 691

• 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

19.10 Reset Operation
19.10.1 Master Reset
19.10.2 Soft Reset
MPC555
USER’S MANUAL
bias drop across D1. Capacitor C1 filters transients, while R2 provides a discharge
bleed path for C1. Allow for RC charge and discharge time constants when applying
and removing power. When using this circuit, keep leakage from external devices con-
nected to the VPP pin low, to minimize diode voltage drop.
The MPC555 / MPC556 signals a master reset (both PORESET or HRESET) to the
CMF EEPROM when a full reset is required. A master reset is the highest priority op-
eration for the CMF EEPROM and will terminate all other operations. The CMF EE-
PROM module uses master reset to initialize all register bits to their reset values. If the
CMF EEPROM is in program or erase operation (EHV = 1) and a master reset is gen-
erated, the module will perform the needed interlocks to disable the high voltage with-
out damage to the high voltage circuits. Master reset will terminate any other mode of
operation and force the CMF EEPROM BIU to a state ready to receive U-bus accesses
within 10 clocks of the end of master reset.
If the HC bit of the reset configuration word = 0 and the SIU requests internal configu-
ration during reset, the CMF EEPROM will provide the reset configuration word to the
device from CMFRC.
A soft reset forces the BIU into a state ready to receive U-bus accesses and clear the
EHV bit. All other register bits remain unaltered by a soft reset.
/
MPC556
*The VPP voltage specification is the voltage at the VPP pin,
VDDL
not the input to diode D1.
Figure 19-10 VPP Conditioning Circuit
CDR MoneT FLASH EEPROM
Rev. 15 October 2000
22KΩ
PROGRAMMING VOLTAGE
D
R
2
2
POWER SUPPLY*
0.1µF
D
C
1
1
V
PP
Pin
MOTOROLA
19-39