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USER CUSTOMIZATION
M68CPU32BUG REV 1 C-20
Q: How can I change the Periodic Interrupt Timer (PIT) "tick" time for the SYSCALL timing
functions?
A: Change the Periodic Interrupt Timer .PITR parameter to alter the "tick" count. This
parameter’s value is placed into the PITR register by the PWR_INI routine.
Q: How can I change the default RS-232 communications parameters, such as baud rate, parity,
number of data bits, stop bits, and XON/XOFF flow control?
A: Use the Console Default Table for SCI (.BAUD, .PARITY, .DATA, .STOP, .XON_ENB,
.XON, and .XOFF) to change these parameters.
Q: How can I change the crystal frequency? Can I use an external clock?
A: Change the FCRYSTAL parameter to alter the crystal frequency for the on-board Voltage
Controlled Oscillator (VCO). To use an external clock, the FEXTAL parameter must be set
to the external clock frequency and the MODCLK* line must be held low during reset.
CPU32Bug monitors the MODCLK* signal after reset to determine which parameter to use
when calculating SCI baud rates.
Q: Why do certain baud rates fail to work after I change the crystal frequency or use an external
clock?
A: There is an integral relationship between the system clock rate (F
SYSTEM
) and QSCI baud
rates, as per Section 5.6.3.1 SCI CONTROL REGISTER 0 (SCCR0), in the MC68332 User’s
Manual, MC68332UM/AD (or in the previous MC68332 System Integration Module User’s
Manual, SIM32UM/AD), as defined by the following equation:
SCI baud = System Clock/(32 x SCBR)
where SCBR equals {1, 2, 3, ..., 8191}. For a specific baud rate to function, the difference
between the Nominal Baud Rate and the Actual Baud Rate as typified by Table 5-13, should
be kept within 3% for reliable operation. Reliable communication also depends greatly upon
the ability of the communications hardware at the other end, i.e., a modern VLSI UART
device, such as found in the IBM-PC, might tollerate baud rate error differences up to 5%.
In summary, all baud rates may not be available depending upon the system clock rate used.
- M68CPU32BUG DEBUG MONITOR 1
- USER’S MANUAL 1
- M68CPU32BUG/D 1
- TABLE OF CONTENTS 3
- M68CPU32BUG/D REV 1 ii 4
- M68CPU32BUG/D REV 1 iii 5
- M68CPU32BUG/D REV 1 iv 6
- M68CPU32BUG/D REV 1 v 7
- LIST OF FIGURES 8
- LIST OF TABLES 8
- CHAPTER 1 9
- 1.1 INTRODUCTION 9
- 1.2 GENERAL DESCRIPTION 9
- GENERAL INFORMATION 10
- M68CPU32BUG/D REV 1 1-2 10
- 1.3 USING THIS MANUAL 11
- 1.5 SYSTEM RESTART 12
- 1.6 MEMORY REQUIREMENTS 13
- Figure 1-2. BCC Memory Map 14
- M68CPU32BUG/D REV 1 1-7 15
- M68CPU32BUG/D REV 1 1-8 16
- CHAPTER 2 17
- DEBUG MONITOR DESCRIPTION 17
- 2.1 INTRODUCTION 17
- M68CPU32BUG/D REV 1 2-2 18
- M68CPU32BUG/D REV 1 2-3 19
- M68CPU32BUG/D REV 1 2-4 20
- M68CPU32BUG/D REV 1 2-5 21
- M68CPU32BUG/D REV 1 2-6 22
- M68CPU32BUG/D REV 1 2-7 23
- M68CPU32BUG/D REV 1 2-8 24
- M68CPU32BUG/D REV 1 2-9 25
- M68CPU32BUG/D REV 1 2-10 26
- M68CPU32BUG/D REV 1 2-11 27
- 2.6 FUNCTION CODE SUPPORT 28
- M68CPU32BUG/D REV 1 2-13 29
- M68CPU32BUG/D REV 1 2-14 30
- CHAPTER 3 31
- 3.1 INTRODUCTION 31
- M68CPU32BUG/D REV 1 3-2 32
- BC Block of Memory Compare BC 33
- BF Block of Memory Fill BF 35
- BM Block of Memory Move BM 37
- BR Breakpoint Insert BR 39
- BS Block of Memory Search BS 40
- BV Block of Memory Verify BV 43
- DC Data Conversion DC 45
- DU Dump S-Records DU 46
- M68CPU32BUG/D REV 1 3-19 49
- M68CPU32BUG/D REV 1 3-20 50
- GN Go To Next Instruction GN 51
- GO Go Execute User Program GO 53
- M68CPU32BUG/D REV 1 3-26 56
- M68CPU32BUG/D REV 1 3-27 57
- HE Help HE 58
- M68CPU32BUG/D REV 1 3-31 61
- M68CPU32BUG/D REV 1 3-32 62
- M68CPU32BUG/D REV 1 3-33 63
- MA Macro Define/Display MA 64
- MAE Macro Edit MAE 67
- M68CPU32BUG/D REV 1 3-39 69
- MD Memory Display MD 70
- MM Memory Modify MM 72
- MS Memory Set MS 74
- M68CPU32BUG/D REV 1 3-45 75
- M68CPU32BUG/D REV 1 3-46 76
- M68CPU32BUG/D REV 1 3-47 77
- PA Printer Attached PA 78
- PF Port Format PF 79
- RD Register Display RD 82
- RESET Cold/Warm Reset RESET 86
- RM Register Modify RM 87
- RS Register Set RS 88
- SD Switch Directories SD 89
- T Trace T 90
- M68CPU32BUG/D REV 1 3-63 93
- Trace on change of flow: 94
- TM Transparent Mode TM 95
- M68CPU32BUG/D REV 1 3-66 96
- M68CPU32BUG/D REV 1 3-67 97
- M68CPU32BUG/D REV 1 3-68 98
- M68CPU32BUG/D REV 1 3-69 99
- DEBUG MONITOR COMMANDS 100
- M68CPU32BUG/D REV 1 3-70 100
- M68CPU32BUG/D REV 1 3-71 101
- M68CPU32BUG/D REV 1 3-72 102
- CHAPTER 4 103
- ASSEMBLER/DISASSEMBLER 103
- 4.1 INTRODUCTION 103
- 4.2SOURCE PROGRAM CODING 104
- M68CPU32BUG/D 4-3 105
- M68CPU32BUG/D 4-4 106
- Pseudo Registers 107
- Main Processor Registers 107
- M68CPU32BUG/D 4-6 108
- M68CPU32BUG/D 4-7 109
- M68CPU32BUG/D 4-8 110
- M68CPU32BUG/D 4-9 111
- M68CPU32BUG/D 4-10 112
- M68CPU32BUG/D 4-11 113
- 0000D000 6000BF68 BRA *-4096 114
- 0000D000 60FE BRA.B * 114
- 0000D000 4EF90000 D000 JMP * 114
- CHAPTER 5 115
- SYSTEM CALLS 115
- 5.1 INTRODUCTION 115
- 5.2 SYSTEM CALL ROUTINES 116
- M68CPU32BUG/D REV 1 5-3 117
- M68CPU32BUG/D REV 1 5-4 118
- M68CPU32BUG/D REV 1 5-5 119
- COUNT = 3 120
- COUNT = 3? 5<CR> 120
- COUNT = 5 120
- COUNT = 3? <CR> 120
- SYSCALL .CHKBRK 121
- BEQ BREAK 121
- M68CPU32BUG/D REV 1 5-8 122
- M68CPU32BUG/D REV 1 5-9 123
- .ERASLN Erase Line .ERASLN 124
- SYSCALL .INCHR Call .INCHR 125
- M68CPU32BUG/D REV 1 5-12 126
- M68CPU32BUG/D REV 1 5-13 127
- M68CPU32BUG/D REV 1 5-14 128
- MOVE.B D0,-(A7) 129
- Send character in D0 129
- SYSCALL .OUTCHR 129
- To default output port 129
- .OUTSTR .OUTSTR 130
- M68CPU32BUG/D REV 1 5-17 131
- PEA (A0) 132
- Long buffer address 132
- SYSCALL .READLN 132
- M68CPU32BUG/D REV 1 5-19 133
- SYSCALL .RETURN 134
- Return to CPU32Bug 134
- .SNDBRK Send Break .SNDBRK 135
- M68CPU32BUG/D REV 1 5-22 136
- SYSCALL .TM_INI 137
- Initialize timer 137
- .TM_RD Read Timer .TM_RD 138
- SYSCALL .TM_STR0 139
- Start Timer at T=0 .TM_STR0 140
- .WRITDLN .WRITDLN 141
- .WRITELN .WRITELN 143
- CHAPTER 6 145
- DIAGNOSTIC FIRMWARE GUIDE 145
- 6.1 INTRODUCTION 145
- 6.2 DIAGNOSTIC MONITOR 145
- M68CPU32BUG/D REV 1 6-2 146
- M68CPU32BUG/D REV 1 6-3 147
- 6.3 UTILITIES 148
- M68CPU32BUG/D REV 1 6-5 149
- CPU CPU Tests For The MCU CPU 150
- CPU A Register Test CPU A 151
- CPU B Instruction Test CPU B 152
- CPU C Address Mode Test CPU C 153
- M68CPU32BUG/D REV 1 6-10 154
- MT Memory Tests MT 155
- M68CPU32BUG/D REV 1 6-12 156
- MT A Set Function Code MT A 157
- MT B Set Start Address MT B 158
- MT C Set Stop Address MT C 159
- MT D Set Bus Data Width MT D 160
- MT E March Address Test MT E 161
- MT F Walk a Bit Test MT F 162
- MT G Refresh Test MT G 163
- MT H Random Byte Test MT H 164
- MT I Program Test MT I 165
- MT J Test and Set Test MT J 166
- BERR Bus Error Test BERR 167
- M68CPU32BUG/D REV 1 6-24 168
- APPENDIX A 169
- S-RECORD INFORMATION 169
- A.1 INTRODUCTION 169
- A.2 S-RECORD CONTENT 169
- A.3 S-RECORD TYPES 170
- A.4 S-RECORDS CREATION 171
- M68CPU32BUG REV 1 A-4 172
- APPENDIX B 173
- SELF-TEST ERROR MESSAGES 173
- B.1 INTRODUCTION 173
- M68CPU32BUG REV 1 B-2 174
- APPENDIX C 175
- USER CUSTOMIZATION 175
- C.1 INTRODUCTION 175
- C.2 CPU32BUG CUSTOMIZATION 176
- M68CPU32BUG REV 1 C-3 177
- C>DEL TMP.MX<CR> 178
- C>DEL C32B1.MX<CR> 178
- C.3 CUSTOMIZATION TABLE 179
- M68CPU32BUG REV 1 C-6 180
- M68CPU32BUG REV 1 C-7 181
- ROM AUTO BOOT VECTORS 182
- Periodic Interrupt Timer 183
- M68CPU32BUG REV 1 C-10 184
- M68CPU32BUG REV 1 C-11 185
- M68CPU32BUG REV 1 C-12 186
- M68CPU32BUG REV 1 C-13 187
- C.4 COMMUNICATION FORMATS 188
- M68CPU32BUG REV 1 C-15 189
- M68CPU32BUG REV 1 C-16 190
- Platform Board 191
- M68CPU32BUG REV 1 C-18 192
- Offset Value Comment 193
- M68CPU32BUG REV 1 C-20 194
- M68CPU32BUG REV 1 C-21 195
- M68CPU32BUG REV 1 C-22 196
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