R4F2125 datasheet(21/700 Pages) RENESAS

21 / 700 page

Rev. 1.00 Sep. 21, 2006 Page xxi of xxxviii

Section 20 PROM (OTP Version) .....................................................................549

20.1

Programmer Mode ............................................................................................................ 550

20.1.1

Programmer Mode Setting ................................................................................ 550

20.1.2

Socket Adapters and Memory Map .................................................................. 550

20.2

Usage Notes ...................................................................................................................... 551

Section 21 Clock Pulse Generator .....................................................................553

21.1

Oscillator........................................................................................................................... 554

21.1.1

Connecting Crystal Resonator .......................................................................... 554

21.1.2

External Clock Input Method............................................................................ 555

21.2

Duty Correction Circuit .................................................................................................... 558

21.3

Medium-Speed Clock Divider .......................................................................................... 558

21.4

Bus Master Clock Select Circuit....................................................................................... 558

21.5

Subclock Input Circuit ...................................................................................................... 559

21.6

Subclock Waveform Forming Circuit............................................................................... 560

21.7

Clock Select Circuit .......................................................................................................... 560

21.8

Usage Notes ...................................................................................................................... 561

21.8.1

Notes on Resonator ........................................................................................... 561

21.8.2

Notes on Board Design ..................................................................................... 561

Section 22 Power-Down Modes ........................................................................563

22.1

Register Descriptions ........................................................................................................ 564

22.1.1

Standby Control Register (SBYCR) ................................................................. 564

22.1.2

Low-Power Control Register (LPWRCR) ........................................................ 566

22.1.3

Module Stop Control Registers H, L, A, and B

(MSTPCRH, MSTPCRL, MSTPCRA, and MSTPCRB).................................. 568

22.2

Mode Transitions and LSI States ...................................................................................... 570

22.3

Medium-Speed Mode ....................................................................................................... 574

22.4

Sleep Mode ....................................................................................................................... 575

22.5

Software Standby Mode.................................................................................................... 576

22.6

Hardware Standby Mode .................................................................................................. 578

22.7

Watch Mode......................................................................................................................579

22.8

Subsleep Mode.................................................................................................................. 580

22.9

Subactive Mode ................................................................................................................ 581

22.10 Module Stop Mode ........................................................................................................... 582

22.11 Direct Transitions ............................................................................................................. 582

22.12 Usage Notes ...................................................................................................................... 583

22.12.1

I/O Port Status................................................................................................... 583

22.12.2

Current Consumption when Waiting for Oscillation Stabilization ................... 583

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