Contents
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 13
9. Usage Precautions ...................................................................................................................... 241
CHAPTER 7-1: VBAT Domain Configuration ........................................................................................ 243
1. Configuration ............................................................................................................................... 244
CHAPTER 7-2: VBAT Domain(A) ............................................................................................................ 245
1. Overview of VBAT Domain .......................................................................................................... 246
2. Configuration of VBAT Domain .................................................................................................... 248
2.1. Interfacing with Always-on Domain ................................................................................. 249
2.2. RTC ................................................................................................................................ 259
2.3. 32 kHz Oscillation Circuit ................................................................................................ 260
2.4. Power-on circuit .............................................................................................................. 262
2.5. Backup Registers ........................................................................................................... 263
2.6. VBAT I/O Ports ............................................................................................................... 265
3. Chip Power Supply Control .......................................................................................................... 268
4. Hibernation Control ...................................................................................................................... 271
5. Procedure for Setting 32 kHz Clock ............................................................................................. 275
6. Procedure for Setting VBAT I/O Port ........................................................................................... 279
7. Registers ..................................................................................................................................... 282
7.1. VB_CLKDIV Register ..................................................................................................... 283
7.2. WTOSCCNT Register .................................................................................................... 284
7.3. CCS/CCB Register ......................................................................................................... 285
7.4. BOOST Register ............................................................................................................. 286
7.5. EWKUP Register ............................................................................................................ 287
7.6. HIBRST Register ............................................................................................................ 288
7.7. VDET Register ................................................................................................................ 289
7.8. Port Function Set Register (VBPFR) .............................................................................. 290
7.9. Pull-up Set Register (VBPCR) ........................................................................................ 292
7.10. Port I/O Direction Set Register (VBDDR) ..................................................................... 293
7.11. Port Input Data Register (VBDIR) ................................................................................. 294
7.12. Port Output Data Register (VBDOR) ............................................................................ 295
7.13. Port Pseudo-Open Drain Set Register (VBPZR) .......................................................... 296
8. Usage Precautions ...................................................................................................................... 297
CHAPTER 7-3: VBAT Domain(B) ............................................................................................................ 299
1. Overview of VBAT Domain .......................................................................................................... 300
2. Configuration of VBAT Domain .................................................................................................... 302
2.1. Interfacing with Always-on Domain ................................................................................. 303
2.2. RTC ................................................................................................................................ 313
2.3. 32 kHz Oscillation Circuit ................................................................................................ 314
2.4. Power-on circuit .............................................................................................................. 316
2.5. Backup Registers ........................................................................................................... 317
2.6. VBAT I/O Ports ............................................................................................................... 319
3. Chip Power Supply Control .......................................................................................................... 322
4. Hibernation Control ...................................................................................................................... 325
5. Procedure for Setting 32 kHz Clock ............................................................................................. 329
6. Procedure for Setting VBAT I/O Port ........................................................................................... 333
7. Registers ..................................................................................................................................... 336
7.1. VB_CLKDIV Register ..................................................................................................... 337
7.2. WTOSCCNT Register .................................................................................................... 338
7.3. CCS/CCB Register ......................................................................................................... 339
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