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M37478RSS Datasheet(PDF) 6 Page - Renesas Technology Corp |
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M37478RSS Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 361 page 7470/7471/7477/7478 GROUP USER’S MANUAL Table of contents iii CHAPTER 2. APPLICATION 2.1 I/O pins .................................................................................................................................... 2-2 2.1.1 I/O port ........................................................................................................................... 2-2 2.1.2 Notes on use ................................................................................................................. 2-5 2.2 Interrupts ................................................................................................................................. 2-7 2.2.1 Memory allocation ......................................................................................................... 2-7 2.2.2 Processor status register (PS) .................................................................................... 2-8 2.2.3 Application example ...................................................................................................... 2-9 2.2.4 Notes on use ................................................................................................................. 2-9 2.3 Timers ..................................................................................................................................... 2-10 2.3.1 Memory allocation ....................................................................................................... 2-10 2.3.2 Application example .................................................................................................... 2-11 2.3.3 Notes on use ............................................................................................................... 2-22 2.4 Serial I/O ................................................................................................................................ 2-23 2.4.1 7470/7471 group memory allocation ....................................................................... 2-23 2.4.2 Application example .................................................................................................... 2-24 2.4.3 7477/7478 group memory allocation ....................................................................... 2-29 2.4.4 Application examples .................................................................................................. 2-30 2.4.5 Notes on use ............................................................................................................... 2-34 2.5 A-D converter ....................................................................................................................... 2-35 2.5.1 Memory allocation ....................................................................................................... 2-35 2.5.2 Application examples .................................................................................................. 2-36 2.5.3 Notes on use ............................................................................................................... 2-38 2.6 Reset ....................................................................................................................................... 2-39 2.6.1 Reset circuit ................................................................................................................. 2-39 2.6.2 Notes on use ............................................................................................................... 2-39 2.7 Oscillation circuit ................................................................................................................ 2-40 2.8 Low-power dissipation function ....................................................................................... 2-41 2.8.1 CPU mode register ..................................................................................................... 2-41 2.8.2 Application examples .................................................................................................. 2-42 2.8.3 Notes on use ............................................................................................................... 2-47 2.9 Countermeasures against noise ......................................................................................2-48 2.9.1 Shortest wiring length ................................................................................................. 2-48 2.9.2 Connection of a bypass capacitor across the VSS line and the VCC line ......... 2-51 2.9.3 Wiring to analog input pins........................................................................................ 2-51 2.9.4 Consideration for oscillator ........................................................................................ 2-52 2.9.5 Setup for I/O ports ...................................................................................................... 2-53 2.9.6 Providing of watchdog timer function by software ................................................ 2-54 2.10 Notes on programming ...................................................................................................... 2-56 2.10.1 Processor status register ......................................................................................... 2-56 2.10.2 Decimal calculations ................................................................................................. 2-57 2.11 Differences between 7470/7471 group and 7477/7478 group .................................. 2-58 |
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