15.4.1 Single Mode (SCAN = 0)..................................................................................... 342
15.4.2 Scan Mode (SCAN = 1) ....................................................................................... 344
15.4.3 Input Sampling and A/D Conversion Time.......................................................... 346
15.4.4 External Trigger Input Timing ............................................................................. 347
15.5 Interrupts............................................................................................................................ 348
15.6 Useage Notes ..................................................................................................................... 348
15.6.1 Setting Ranges of Analog Power Supply Pins, Etc. ............................................. 348
15.6.2 Notes on Board Design ........................................................................................ 348
15.6.3 Notes on Noise ..................................................................................................... 348
15.6.4 A/D Conversion Accuracy Definitions ................................................................ 349
15.6.5 Allowable Signal-Source Impedance ................................................................... 351
15.6.6 Effect on Absolute Accuracy................................................................................ 352
Section 16 D/A Converter (H8/3337 Series Only) .................................................... 353
16.1 Overview............................................................................................................................ 353
16.1.1 Features ................................................................................................................ 353
16.1.2 Block Diagram...................................................................................................... 354
16.1.3 Input and Output Pins........................................................................................... 355
16.1.4 Register Configuration ......................................................................................... 355
16.2 Register Descriptions ........................................................................................................ 356
16.2.1 D/A Data Registers 0 and 1 (DADR0, DADR1).................................................. 356
16.2.2 D/A Control Register (DACR)............................................................................. 356
16.3 Operation ........................................................................................................................... 358
Section 17 RAM................................................................................................................... 359
17.1 Overview............................................................................................................................ 359
17.1.1 Block Diagram...................................................................................................... 359
17.1.2 RAM Enable Bit (RAME) in System Control Register (SYSCR)....................... 360
17.2 Operation ........................................................................................................................... 360
17.2.1 Expanded Modes (Modes 1 and 2)....................................................................... 360
17.2.2 Single-Chip Mode (Mode 3) ................................................................................ 360
Section 18 ROM (Mask ROM Version/ZTAT Version).......................................... 361
18.1 Overview............................................................................................................................ 361
18.1.1 Block Diagram...................................................................................................... 362
18.2 Writer Mode (H8/3337Y, H8/3334Y)............................................................................... 362
18.2.1 Writer Mode Setup ............................................................................................... 362
18.2.2 Socket Adapter Pin Assignments and Memory Map ........................................... 363
18.3 PROM Programming......................................................................................................... 366
18.3.1 Programming and Verification............................................................................. 366
18.3.2 Notes on Programming......................................................................................... 371
18.3.3 Reliability of Programmed Data .......................................................................... 371
18.3.4 Erasing Data ......................................................................................................... 372
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