mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 271

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

System Interface Unit
12.1 FEATURES
The following is a list of the system interface unit’s main features:
12.2 SYSTEM CONFIGURATION AND PROTECTION
The MPC823 incorporates many system functions that normally must be provided in
external circuits. It is designed to provide maximum system safeguards against hardware
and/or software faults. The following features are provided in the system configuration and
protection submodule:
• System Configuration and Protection
• System Interrupt Configuration
• System Reset Monitoring and Generation
• Clock Synthesizer
• Power Management
• Real-Time Clock
• PowerPC Decrementer
• Timebase
• Periodic Interrupt Timer
• External Bus Interface Control
• Eight Memory Banks Supported By the Memory Controller
• Debug Support
• PCMCIA Host Adapter Module Supports Eight Memory or I/O Windows
• IEEE 1149.1 Test Access Port
• Interrupt Configuration —Allows you to configure the system according to your own
• Bus Monitor —Monitors the TA response time for all bus accesses initiated by the
• Software Watchdog Timer—Asserts a reset or nonmaskable interrupt that is selected
requirements. The functions include control of parity checking, show cycle operation,
and part and mask number constants.
internal masters. A TEA signal is asserted if the TA response limit is exceeded. The bus
monitor measures time between TS and any termination of the bus cycle, including TA,
TEA, and RETRY.
by the system protection control register (SYPCR) if the software fails to service the
software watchdog timer after a certain period of time. After system reset, the software
watchdog timer, if enabled, selects a maximum timeout period and asserts a system
reset if the timeout is reached. The software watchdog timer can be disabled or its
timeout period can be changed in the SYPCR. Once the SYPCR is written, it cannot be
written again until a system reset.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
MOTOROLA