MPC8272ADS Freescale Semiconductor, MPC8272ADS Datasheet - Page 45

• Manufacturer Part Number: MPC8272ADS
• Description: KIT DEVELOPMENT MPC8272
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8272ADS

• Contents: Board
• For Use With/related Products: MPC8272
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 5
Module Design
This chapter provides information about the functionality and design details of the various
modules that constitute the MPC8272ADS.
5.1
The following are reset sources on the MPC8272ADS:
5.1.1
The power-on reset to the MPC8272 initializes the processor state after power-on. A
dedicated logic using Seiko S-80728AN-DR-T1, which is a voltage detector of 2.8V +/-
2.4%, assert
period is sufficient to cover the V
regulator. It is assumed that the stabilization time for both linear regulators (see Section 7.1,
“Power Supply”) are about the same. Furthermore, power-on reset may be generated
manually by an on-board dedicated push-button (SW1). Power-on reset can also be
generated by the JTAG logic, which is integrated with BCSR.
5.1.2
At the end of Power - On reset sequence, MODCK(1:3) are sampled by the MPC8272 to
configure the various clock modes of the MPC8272 (core, cpm, bus, PCI...). Selection
between the MODCK(1:3) combination options is done by means of dip-switches on the
mother board while PCI_MODCKH(0:3) are obtained from the relevant dedicated
dip-switches.
• Power-on reset
• Manual hard reset
• Manual soft reset
• PCI bus reset
• MPC8272 internal sources. For more information, see the MPC8272 PowerQUICC
II
TM
Reset and Reset Configuration
Power-On Reset
Power-On Reset Configuration
Family Reference Manual.
s
PORESET input to the PowerQUICC II for a period of ~2.5sec. This time
Chapter 5. Module Design
DDL
stabilization also, powered by a different voltage