ii
7540 Group User’s Manual
Table of contents
CHAPTER 2 APPLICATION
2.1 I/O port.....................................................................................................................................2-2
2.1.1 Memory map ...................................................................................................................2-2
2.1.2 Relevant registers ..........................................................................................................2-3
2.1.3 Application example of key-on wake up (1)...............................................................2-7
2.1.4 Application example of key-on wake up (2)...............................................................2-9
2.1.5 Handling of unused pins .............................................................................................2-10
2.1.6 Notes on input and output ports................................................................................2-11
2.1.7 Termination of unused pins ........................................................................................2-12
2.2 Timer A ..................................................................................................................................2-13
2.2.1 Memory map .................................................................................................................2-13
2.2.2 Relevant registers ........................................................................................................2-14
2.2.3 Timer mode...................................................................................................................2-19
2.2.4 Period measurement mode.........................................................................................2-22
2.2.5 Event counter mode.....................................................................................................2-26
2.2.6 Pulse width HL continuously measurement mode...................................................2-30
2.2.7 Notes on timer A..........................................................................................................2-35
2.3 Timer 1...................................................................................................................................2-36
2.3.1 Memory map .................................................................................................................2-36
2.3.2 Relevant registers ........................................................................................................2-36
2.3.3 Timer 1 operation description.....................................................................................2-39
2.3.4 Notes on timer 1 ..........................................................................................................2-39
2.4 Timer X ..................................................................................................................................2-40
2.4.1 Memory map .................................................................................................................2-40
2.4.2 Relevant registers ........................................................................................................2-41
2.4.3 Timer mode...................................................................................................................2-46
2.4.4 Pulse output mode.......................................................................................................2-50
2.4.5 Event counter mode.....................................................................................................2-54
2.4.6 Pulse width measurement mode................................................................................2-58
2.4.7 Notes on timer X..........................................................................................................2-62
2.5 Timer Y and timer Z ...........................................................................................................2-63
2.5.1 Memory map .................................................................................................................2-63
2.5.2 Relevant registers ........................................................................................................2-64
2.5.3 Timer mode (timer Y and timer Z) ............................................................................2-73
2.5.4 Programmable waveform generation mode (timer Y and timer Z) .......................2-77
2.5.5 Programmable one-shot generation mode (timer Z) ...............................................2-84
2.5.6 Programmable wait one-shot generation mode (timer Z).......................................2-91
2.5.7 Notes on timer Y and timer Z....................................................................................2-99
2.6 Serial I/O1............................................................................................................................2-101
2.6.1 Memory map ...............................................................................................................2-101
2.6.2 Relevant registers ......................................................................................................2-101
2.6.3 Serial I/O1 transfer data format ...............................................................................2-105
2.6.4 Application example of clock synchronous serial I/O1 .........................................2-106
2.6.5 Application example of clock asynchronous serial I/O1 .......................................2-112
2.6.6 Notes on Serial I/O1..................................................................................................2-118
2.7 Serial I/O2............................................................................................................................2-120
2.7.1 Memory map ...............................................................................................................2-120
2.7.2 Relevant registers ......................................................................................................2-120
2.7.3 Application example of serial I/O2...........................................................................2-123
2.7.4 Notes on serial I/O2 ..................................................................................................2-128
2.8 A-D converter .....................................................................................................................2-129
2.8.1 Memory map ...............................................................................................................2-129
2.8.2 Relevant registers ......................................................................................................2-129
2.8.3 A-D converter application examples........................................................................2-132
2.8.4 Notes on A-D converter ............................................................................................2-134