参数资料
型号: MPC8272ADS
厂商: Freescale Semiconductor
文件页数: 45/158页
文件大小: 0K
描述: KIT DEVELOPMENT MPC8272
标准包装: 1
类型: MPU
适用于相关产品: MPC8272
所含物品:
Chapter 5
Module Design
This chapter provides information about the functionality and design details of the various
modules that constitute the MPC8272ADS.
5.1
Reset and Reset Configuration
The following are reset sources on the MPC8272ADS:
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5.1.1
Power-on reset
Manual hard reset
Manual soft reset
PCI bus reset
MPC8272 internal sources. For more information, see the MPC8272 PowerQUICC
II TM Family Reference Manual .
Power-On Reset
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 s PORESET input to the PowerQUICC II for a period of ~2.5sec. This time
period is sufficient to cover the V DDL stabilization also, powered by a different voltage
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
Power-On Reset Configuration
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.
Chapter 5. Module Design
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MPC8272CVRB 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
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MPC8272CVRM 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications