ML674000 CPU示例程序用户手册

1.1 About This Document .... 1
1.2 Related Documents. 1
2 Sample Program Overview....2
2.1 Sample Programs Included . 2
2.2 Operating Environment.. 3
2.3 File Components  3
3 Sample Programs Specifications..4
3.1 Shared Specifications.... 4
3.1.1 LED Patterns . 4
3.1.2 Configuring Clock Gear . 5
3.2 IRQ Interrupt Requests.. 6
3.2.1 IRQ Handlers 6
3.2.2 Handlers for Individual Interrupt Sources ... 7
3.2.3 IRQ Handler Table ... 8
3.3 Initializing Microcontroller .... 9
3.3.1 Modules Used 9
3.3.2 Operational Description.. 9
3.3.3 Flowchart 9
3.4 External Memory Controller (SRAM and ROM)  10
3.4.1 Modules Used... 10
3.4.2 Operational Description 10
3.4.3 Flowcharts ... 11
3.5 External Memory Controller (DRAM) .... 12
3.5.1 Modules Used... 12
3.5.2 Operational Description 12
3.5.3 Flowcharts ... 14
3.6 IRQ Exception Handler (Without Nesting) and System Timer .. 15
3.6.1 Modules Used... 15
3.6.2 Operational Description 15
3.6.3 Flowcharts ... 16
3.7 IRQ Exception Handler (With Nesting) . 17
3.7.1 Modules Used... 17
3.7.2 Operational Description 17
3.7.3 Flowchart.... 19
3.8 Asynchronous Serial Interface (SIO) .... 20
3.8.1 Modules Used... 20
ML674000 CPU Board Sample Programs User’s Manual
ii
3.8.2 Operational Description 20
3.8.3 Configuring Serial Interface .... 20
3.8.4 Flowcharts ... 21
3.8.5 Specifying Reload Value in SIOBT..... 24
3.9 Buffered Asynchronous Serial Interface (UART)..... 25
3.9.1 Modules Used... 25
3.9.2 Operational Description 25
3.9.3 Configuring Serial Interface .... 25
3.9.4 Flowcharts ... 26
3.9.5 Calculating Frequency Divider 29
3.10 I/O Ports..... 30
3.10.1 Modules Used... 30
3.10.2 Operational Description 30
3.10.3 Flowchart.... 31
3.11 Memory Remapping .... 32
3.11.1 Modules Used... 32
3.11.2 Operational Description 32
3.11.3 Flowcharts ... 33
3.12 Power Management .... 34
3.12.1 Modules Used... 34
3.12.2 Operational Description 34
3.12.2.1 RUN State...35
3.12.2.2 HALT State.36
3.12.2.3 STANDBY State.....36
3.12.3 Configuring Serial Interface .... 36
3.12.4 Flowchart.... 37
3.13 Auto Reload Timers..... 38
3.13.1 Modules Used... 38
3.13.2 Operational Description 38
3.13.3 Flowcharts ... 39
3.14 Watchdog Timer (WDT)..... 40
3.14.1 Modules Used... 40
3.14.2 Operational Description 40
3.14.3 Flowcharts ... 41
3.15 PWM Generator .... 42
3.15.1 Modules Used... 42
3.15.2 Operational Description 42
3.15.3 Flowcharts ... 44
3.16 Direct Memory Access Controller (DMAC).. 45
3.16.1 Modules Used... 45
3.16.2 Operational Description 45
3.16.3 Flowcharts ... 48
3.17 Analog-to-Digital Converter ..... 50
3.17.1 Modules Used... 50
3.17.2 Operational Description 50
3.17.3 Flowcharts ... 51
3.17.4 Checking Conversion Results.. 52
4 Running Sample Programs .53
4.1 Execution Procedure ... 53
4.1.1 Configuring ML674000 CPU Board ... 53
4.1.2 Connecting Serial Cable and Configuring Terminal Software . 53
4.1.3 Connecting Constant-Voltage Power Supply..... 54
4.1.4 Copying Files ... 54
4.1.5 Loading APM and Opening Project File ... 55
4.1.6 Configuring APM... 56
4.1.7 Creating Executable Image File .... 57
4.1.8 Loading ARM Debugger for Windows ..... 58
4.1.9 Configuring ARM Debugger for Windows . 60
4.2 Running Sample Program . 62
4.3 Execution Results.. 63
4.3.1 External Memory Controller (SRAM and ROM)... 63
4.3.2 External Memory Controller (DRAM) 63
4.3.3 System Timer.... 64
4.3.4 Asynchronous Serial Interface (SIO) .. 65
4.3.5 Buffered Asynchronous Serial Interface (UART) .. 66
4.3.6 I/O Ports ..... 67
4.3.7 Memory Remapping..... 68
4.3.8 Power Management 70
4.3.9 Auto Reload Timers ..... 71
4.3.10 Watchdog Timer (WDT)..... 72
4.3.11 PWM Generator ..... 72
4.3.12 Direct Memory Access Controller (DMAC) ..... 73
4.3.13 Analog-to-Digital Converter ... 75
4.4 Terminating Sample Programs  77