Motorola MPC823e - Page 11

TABLE OF CONTENTS (Continued)
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Number Title Number
MOTOROLA MPC823e REFERENCE MANUAL ix
12.4 The Bus Monitor ................................................................................12-11
12.5 The PowerPC Decrementer ..............................................................12-12
12.5.1 Decrementer Register ............................................................12-13
12.6 The PowerPC Timebase ...................................................................12-14
12.6.1 Timebase Register .................................................................12-14
12.6.2 Timebase Reference Registers ..............................................12-15
12.6.3 Timebase Status and Control Register ..................................12-16
12.7 The Real-Time Clock ........................................................................12-17
12.7.1 Real-Time Clock Status and Control Register ........................12-18
12.7.2 Real-Time Clock Register ......................................................12-19
12.7.3 Real-Time Clock Alarm Seconds Register .............................12-20
12.7.4 Real-Time Clock Alarm Register ............................................12-21
12.8 The Periodic Interrupt Timer .............................................................12-22
12.8.1 Periodic Interrupt Status and Control Register .......................12-23
12.8.2 Periodic Interrupt Timer Count Register .................................12-24
12.8.3 Periodic Interrupt Timer Register ...........................................12-25
12.9 The Software Watchdog Timer .........................................................12-26
12.9.1 Software Service Register ......................................................12-27
12.10 Freeze Operation ..............................................................................12-28
12.10.1 Low-Power Stop Operation ....................................................12-28
12.11 Multiplexing the System Interface Unit Pins ......................................12-29
12.12 Programming the System Interface Unit ...........................................12-30
12.12.1 System Configuration and Protection Registers .....................12-30
12.12.1.1 SIU Module Configuration Register ............................12-30
12.12.1.2 Internal Memory Map Register ...................................12-34
12.12.1.3 System Protection Control Register ............................12-35
12.12.1.4 Transfer Error Status Register ....................................12-36
Section 13
External Bus Interface
13.1 Features ..............................................................................................13-1
13.2 Transfer Signals ..................................................................................13-1
13.2.1 Control Signals .........................................................................13-3
13.3 Bus Signal Descriptions ......................................................................13-4
13.4 Bus Interface Operation ......................................................................13-7
13.4.1 Basic Transfers ........................................................................13-8
13.4.2 Single Beat Transfers ...............................................................13-8
13.4.2.1 Single Beat Read Flow .................................................13-9
13.4.2.2 Single Beat Write Flow ...............................................13-12
13.4.3 Burst Transfers .......................................................................13-16
13.4.4 The Burst Mechanism ............................................................13-16