Freescale Semiconductor M68HC12A4EVB User manual

M68HC12A4EVB
EVALUATION BOARD
USER’S MANUAL
M68HC12A4EVBUM/D
October 1999
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Important Notice to Users
While every effort has been made to ensure the accuracy of all information in
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Motorola further assumes no liability arising out of the application or use of any
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or consequential damages arising from the use of this document. Motorola
disclaims all warranties regarding the information contained herein, whether
expressed, implied, or statutory, including implied warranties of
merchantability or fitness for a particular purpose. Motorola makes no
representation that the interconnection of products in the manner described
herein will not infringe on existing or future patent rights, nor do the
descriptions contained herein imply the granting or license to make, use or sell
equipment constructed in accordance with this description.
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MCUez is a trademark of Motorola, Inc.
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© Motorola, Inc., 1999; All Rights Reserved
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M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA List of Sections 3
User’s Manual — M68HC12A4EVB Evaluation Board
List of Sections
Section 1. General Information . . . . . . . . . . . . . . . . . . . .15
Section 2. Configuration and Setup . . . . . . . . . . . . . . . .27
Section 3. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Section 4. Hardware Reference . . . . . . . . . . . . . . . . . . . .77
Appendix A. S-Record Format. . . . . . . . . . . . . . . . . . . .117
Appendix B. Communications Program Examples . . .123
Appendix C. D-Bug12 Startup Code . . . . . . . . . . . . . . .131
Appendix D. D-Bug12 Customization Data. . . . . . . . . .135
Appendix E. Customizing the EPROMs . . . . . . . . . . . .141
Appendix F. SDI Configuration . . . . . . . . . . . . . . . . . . .143
Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
4 List of Sections MOTOROLA
List of Sections
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M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA Table of Contents 5
User’s Manual — M68HC12A4EVB Evaluation Board
Table of Contents
Section 1. General Information
1.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3 General Description and Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.4 Performance Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.5 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.6 External Equipment Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.7 EVB Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.8 Typographic Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.9 Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Section 2. Configuration and Setup
2.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.2 Unpacking and Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3 EVB Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.4 EVB to Power Supply Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5 EVB to Terminal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.6 Terminal Communications Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.1 Communication Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.2 Dumb-Terminal Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.3 Host-Computer Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.4 Changing the Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
6 Table of Contents MOTOROLA
Table of Contents
2.7 Using Fast External RAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.7.1 Selecting and Replacing the RAM Chips . . . . . . . . . . . . . . . . . . . 32
2.7.2 Reprogramming the RAM Chip Select . . . . . . . . . . . . . . . . . . . . . 33
Section 3. Operation
3.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.2 Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.3 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.4 Program Abort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.5 Using D-Bug12 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.6 D-Bug12 Command Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
ASM Assemble Instructions . . . . . . . . . . . . . . . . . . . . . 44
BAUD Set Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
BF Block Fill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
BR Breakpoint Set . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
BULK Bulk Erase On-Chip EEPROM . . . . . . . . . . . . . . 51
CALL Call Subroutine . . . . . . . . . . . . . . . . . . . . . . . . . . 52
G Go Execute a User Program . . . . . . . . . . . . . . . . 53
GT Go Till . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
HELP Onscreen Help Summary. . . . . . . . . . . . . . . . . . . 55
LOAD Load S-Record File . . . . . . . . . . . . . . . . . . . . . . . 56
MD Memory Display . . . . . . . . . . . . . . . . . . . . . . . . . 57
MDW Display Memory as 16-Bit Word . . . . . . . . . . . . 58
MM Memory Modify. . . . . . . . . . . . . . . . . . . . . . . . . . 59
MMW Modify 16-Bit Memory Word. . . . . . . . . . . . . . . 60
MOVE Move Memory Block. . . . . . . . . . . . . . . . . . . . . . 61
NOBR Remove Breakpoints . . . . . . . . . . . . . . . . . . . . . . 62
RD Register Display. . . . . . . . . . . . . . . . . . . . . . . . . . 63
RM Register Modify. . . . . . . . . . . . . . . . . . . . . . . . . . 64
T Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
UPLOAD Display Memory in S-Record Format . . . . . . . . . 67
VERF Verify S-Record File Against Memory . . . . . . . . 68
<RegisterName> Modify Register Value . . . . . . . . . . . . . . . . . . . . 70
3.7 Alternate Execution from EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . 72
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Table of Contents
M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA Table of Contents 7
3.8 Off-Board Code Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.9 Memory Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.9.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.9.2 Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.10 Operational Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.10.1 On-Chip RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.10.2 SCI Port Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.10.3 Dedicated MCU Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.10.4 Terminal Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Section 4. Hardware Reference
4.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.2 Printed Circuit Board (PCB) Description. . . . . . . . . . . . . . . . . . . . . . 78
4.3 Configuration Headers and Jumper Settings. . . . . . . . . . . . . . . . . . . . 78
4.4 Power Input Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
4.5 Terminal Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
4.6 Microcontroller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.7 Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.7.1 Memory Types and Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.7.2 Chip Selects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
4.7.3 Glue Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.8 Clock Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.9 Phase-Locked Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.11 Low-Voltage Inhibit (LVI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4.12 Analog-to-Digital (A/D) Converter . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4.13 Background Debug Mode (BDM) Interface. . . . . . . . . . . . . . . . . . . . 91
4.14 Prototype Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
4.15 MCU Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
4.16 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
8 Table of Contents MOTOROLA
Table of Contents
Appendix A. S-Record Format
A.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.2 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.3 S-Record Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
A.4 S-Record Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
A.5 S Record Creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
A.6 S-Record Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
A.6.1 S0 Header Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
A.6.2 First S1 Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
A.6.3 S9 Termination Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
A.6.4 ASCII Characters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Appendix B. Communications Program Examples
B.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
B.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3 Procomm for DOS — IBM PC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
B.3.2 S-Record Transfers to EVB Memory. . . . . . . . . . . . . . . . . . . . . . 126
B.4 Kermit for DOS — IBM PC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
B.4.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
B.4.2 S-Record Transfers to EVB Memory. . . . . . . . . . . . . . . . . . . . . . 127
B.5 Kermit — Sun Workstation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
B.5.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
B.5.2 S-Record Transfers to EVB Memory. . . . . . . . . . . . . . . . . . . . . . 128
B.6 MacTerminal — Apple Macintosh. . . . . . . . . . . . . . . . . . . . . . . . . . 128
B.6.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
B.6.2 S-Record Transfers to EVB Memory. . . . . . . . . . . . . . . . . . . . . . 129
B.7 Red Ryder — Apple Macintosh . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
B.7.1 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
B.7.2 S-Record Transfers to EVB Memory. . . . . . . . . . . . . . . . . . . . . . 130
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Table of Contents
M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA Table of Contents 9
Appendix C. D-Bug12 Startup Code
Appendix D. D-Bug12 Customization Data
D.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
D.2 Customization Data Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
D.2.1 C Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
D.2.2 Assembly Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
D.2.3 Initial User CPU Register Values . . . . . . . . . . . . . . . . . . . . . . . . 136
D.2.4 SysClk Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
D.2.5 IOBase Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
D.2.6 SCIBaudRegVal Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
D.2.7 EEBase and EESize Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
D.2.8 EEPROM Erase/Program Delay Function Pointer Field. . . . . . . 138
D.2.9 Auxiliary Command Table Entries . . . . . . . . . . . . . . . . . . . . . . . 138
Appendix E. Customizing the EPROMs
Appendix F. SDI Configuration
Glossary
Index
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
10 Table of Contents MOTOROLA
Table of Contents
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M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA List of Figures 11
User’s Manual — M68HC12A4EVB Evaluation Board
List of Figures
Figure Title Page
1-1 EVB Layout and Component Placement . . . . . . . . . . . . . . . . . . . . . . 18
1-2 System Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2-1 EVB Power Connector J6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4-1 Memory Sockets Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
4-2 Chip Select Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
4-3 RAM/ROM Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4-4 Prototype Area (Component Side View) . . . . . . . . . . . . . . . . . . . . . . 93
4-5 MCU Connector J8 (Component-Side View). . . . . . . . . . . . . . . . . . . 94
4-6 MCU Connector J9 (Component-Side View). . . . . . . . . . . . . . . . . . . 95
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
12 List of Figures MOTOROLA
List of Figures
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M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA List of Tables 13
User’s Manual — M68HC12A4EVB Evaluation Board
List of Tables
Table Title Page
1-1 EVB Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2-1 RS-232C Interface Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2-2 Communication Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3-1 D-Bug12 Command-Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3-2 M68HC11 to CPU12 Instruction Translation. . . . . . . . . . . . . . . . . . . 45
3-3 CPU12 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3-4 Condition Code Register Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3-5 Factory-Configuration Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . 74
4-1 Jumper-Selectable Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4-2 CPU Mode Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
4-3 EVB Memories Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
4-4 BDM Connector J5 Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . 92
4-5 MCU Connector J8 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . 96
4-6 MCU Connector J9 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . 98
A-1 S-Record Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
A-2 S-Record Field Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
A-3 S-Record Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
A-4 S0 Header Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
A-5 S1 Header Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
A-6 S9 Header Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
E-1 Physical EPROM Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
F-1 SDI Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
14 List of Tables MOTOROLA
List of Tables
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M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA General Information 15
User’s Manual — M68HC12A4EVB Evaluation Board
Section 1. General Information
1.1 Contents
1.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3 General Description and Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.4 Performance Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.5 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.6 External Equipment Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.7 EVB Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.8 Typographic Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.9 Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.2 Introduction
This user’s manual provides the necessary information for using the
M68HC12A4EVB evaluation board (EVB), an evaluation, debugging, and
code-generation tool for the MC68HC812A4 microcontroller units (MCU).
Reference items, such as schematic diagrams and parts lists, are shipped as part
of the EVB package.
1.3 General Description and Features
The EVB is an economical tool for designing and debugging code for and
evaluating the operation of the M68HC12 MCU Family. By providing the
essential MCU timing and input/output (I/O) circuitry, the EVB simplifies user
evaluation of prototype hardware and software.
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
16 General Information MOTOROLA
General Information
The board consists of an 8-inch by 8-inch multi-layer printed circuit board
(PCB) that provides the platform for interface and power connections to the
MC68HC812A4 MCU chip, which is installed in a production socket.
Figure 1-1 shows the EVB’s layout and locations of the major components, as
viewed from the component side of the board.
The block diagram in Figure 1-2 depicts the logical relationships and
interconnections within the EVB and with external equipment.
Hardware features of the EVB include:
• Power, ground, and four signal planes
• Single-supply +3- to +5-Vdc power input (J6)
• Two RS-232C interfaces
• Two memory sockets populated with two 32-Kbyte x 8-bit EPROMs
(U7 and U9A), containing the D-Bug12 monitor program
• Two memory sockets populated with two 8-Kbyte x 8-bit SRAMs
(U4 and U6A)
• Support for up to 1 MByte of program space and 512 Kbytes of data
space using optional memory configurations
• 16-MHz crystal-controlled clock oscillator (Y2) in a socket that can
accommodate optional 8- or 14-pin oscillator chips (XY2)
• Headers for jumper selection of hardware options (for full details of the
jumper settings, refer to Table 4-1):
– Low-voltage inhibit (LVI) (W1)
– RAM (random-access memory) write-protection (W3)
– MCU chip selects for memory devices (W11)
– RAM function select (W12 and W13)
– ROM (read-only memory) function select (W22, W24, W29, W32,
W33, and W36)
– MCU mode control (W30, W34, and W42)
– Alternate execution from on-chip EEPROM (W20)
– Serial communications interface (SCI) configuration (W10, W14,
and W21)
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General Information
General Description and Features
M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA General Information 17
• Two 2-row x 30-pin header connectors for access to the MCU’s I/O and
bus lines (J8 and J9)
• Prototype expansion area for customized interfacing with the MCU
• Low-profile reset (S1) and program-abort (S2) push-button switches
• LVI protection (U1)
• Light-emitting diode (LED) power-on indicator (DS1)
• Test points for ground connections around the board (E1, E2, E3, E12,
E13, and E14)
• 2-row x 3-pin header (J5) provides a connector for using background
debug development tools such as the serial debug interface (SDI)
• Phase-locked loop (PLL) biasing circuitry for altering the MCU’s
timebase
Firmware features include:
• D-Bug12 monitor/debugger program, resident in external EPROM
(erasable programmable read-only memory)
• Full support for either dumb-terminal or host-computer terminal
interface
• Single-line assembler/disassembler
• File transfer capability from a host computer, allowing off-board code
generation
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
18 General Information MOTOROLA
General Information
Figure 1-1. EVB Layout and Component Placement
PROTOTYPE AREA
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General Information
Performance Notes
M68HC12A4EVB Evaluation Board — Rev. 1 User’s Manual
MOTOROLA General Information 19
Figure 1-2. System Block Diagram
1.4 Performance Notes
The M68HC12A4EVB’s external RAM memory chips, U4 and U6A, were
chosen to emphasize the EVB’s low-voltage and low-power operational
capability over the range of +3.5 to +5.0 Vdc.
However, these parts are not fast enough to operate at the 16-MHz speed of the
factory-supplied clock oscillator. To use them at this external clock speed, the
D-Bug12 startup code programs the MCU’s RAM chip select to insert one wait
state into each access of external RAM. Thus, when programs are run from
PROTO-
TYPE
AREA
J8 / J9
S1 RESET
MCU
MC68HC812A4
M68HC12A4EVB
SCI0
SCI1
ON-CHIP
EEPROM
RAM
ON-CHIP
112 PINS
TOTAL
RS-232C
TRANSCEIVER
J3
J2
J6
J5
TERMINAL
SPARE
POWER
BDM INTERFACE
S2 – PROGRAM ABORT
CLOCK
EXTERNAL
ROM
AND
RAM
GLUE
LOGIC
EXTAL
XTAL
XFC
VDD/6
VSS/6
PA [7:0]
PB [7:0]
PC [7:0]
PD [7:0]
PE [7:0]
PF [6:0]
PG [5:0]
PH [7:0]
PJ [7:0]
PAD [7:0]
VRH, VRL
BKGD
PS [7:0]
PT [7:0]
RESET
J7
BKGD
EXTAL
PE0/XIRQ
PA [7:0]
PB [7:0]
PC [7:0]
PD [7:0]
PE [6:0]
PG [5:0]
PE2/RW
PE3/LSTRB
EXTERNAL CLOCK
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User’s Manual M68HC12A4EVB Evaluation Board — Rev. 1
20 General Information MOTOROLA
General Information
external RAM, performance is approximately 40 percent slower than it would
be if the RAM chips were fast enough to run without wait states. Typical
software performance improvements of 80 to 95 percent can be realized with
faster external RAM.
For high-speed performance, the factory-supplied RAM devices may be
replaced with faster parts that allow programs to execute at the full external
clock speed. Two steps are required for this:
1. Replace the RAM devices, U4 and U6A, with faster parts.
2. Modify the RAM chip select to eliminate the wait state (E-clock stretch).
Detailed instructions for these procedures are found in 2.7Using Fast External
RAM.
NOTE: Programsthatexecuteexclusively from theMCU’son-chip RAM andEEPROM
alwaysrun at the full clock speed. Nowait states are introduced whenaccessing
these areas.
Table 3-5. Factory-Configuration Memory Map, the default memory map,
depicts the addresses of the EVB’s different memory areas.
1.5 Functional Overview
The EVB is factory-configured to execute D-Bug12, the EPROM-resident
monitor program, without further configuration by the user. It is ready for use
with an RS-232C terminal for writing and debugging user code. Follow the
setup instructions in Section 2. Configuration and Setup to prepare for
operation.
Optionally, the EVB can accommodate various types and configurations of
external memory to suit a particular application’s requirements. These custom
configurations are made by installing the appropriate memory chips in the
EVB’s memory sockets and by setting jumpers on the EVB to correctly
establish the MC68HC812A4’s memory-access operations. Table 1-1 lists the
allowable sizes and types of memory. For the correct jumper settings, refer to
4.3 Configuration Headers and Jumper Settings.
NOTE: The D-Bug12 operating instructions in this manual presume the factory-default
memory configuration. Other configurations require different
operating-software arrangements.
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