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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