
ii
38B7 Group User’s Manual
List of figures
Fig. 47 Structure of FLDC related registers (3) ...................................................................... 1-48
Fig. 48 Structure of FLDC related registers (4) ...................................................................... 1-49
Fig. 49 Segment/Digit setting example ..................................................................................... 1-50
Fig. 50 FLD automatic display RAM assignment .................................................................... 1-51
Fig. 51 Example of using FLD automatic display RAM in 16-timingordinary mode ......... 1-52
Fig. 52 Example of using FLD automatic display RAM in 16-timinggradation display mode
........................................................................................................................................................ 1-53
Fig. 53 Example of using FLD automatic display RAM in 32-timing mode ......................... 1-54
Fig. 54 FLD and digit output timing .......................................................................................... 1-55
Fig. 55 Timing using digit interrupt ........................................................................................... 1-56
Fig. 56 Timing using FLD blanking interrupt ............................................................................ 1-57
Fig. 57 P64 to P67 FLD output pulses ...................................................................................... 1-58
Fig. 58 Toff section generating/nothing function ..................................................................... 1-59
Fig. 59 Digit pulses output function .......................................................................................... 1-60
Fig. 60 Structure of AD/DA control register ............................................................................. 1-61
Fig. 61 Black diagram of A-D converter ................................................................................... 1-61
Fig. 62 Black diagram of D-A converter ................................................................................... 1-62
Fig. 63 Equivalent connection circuit of D-A converter .......................................................... 1-62
Fig. 64 PWM block diagram ....................................................................................................... 1-63
Fig. 65 PWM timing ..................................................................................................................... 1-64
Fig. 66 Structure of PWM control register ............................................................................... 1-65
Fig. 67 14-bit PWM timing .......................................................................................................... 1-65
Fig. 68 Interrupt interval determination circuit block diagram ............................................... 1-66
Fig. 69 Structure of itnerrupt interval determination control register .................................... 1-67
Fig. 70 Interrupt inteval determination operation example (at rising edge active) ............. 1-67
Fig. 71 Interrupt interval determination operation example (at both-sided edge active) ... 1-67
Fig. 72 Block diagram of watchdog timer ................................................................................. 1-68
Fig. 73 Structure of watchdog timer control register .............................................................. 1-68
Fig. 74 Block diagram of buzzer output circuit ........................................................................ 1-69
Fig. 75 Structure of buzzer output control register ................................................................ 1-69
Fig. 76 Reset circuit example .................................................................................................... 1-70
Fig. 77 Reset sequence .............................................................................................................. 1-70
Fig. 78 Internal status at reset .................................................................................................. 1-71
Fig. 79 Ceramic resonator circuit .............................................................................................. 1-72
Fig. 80 External clock input circuit ............................................................................................ 1-72
Fig. 81 Clock generating circuit block diagram ....................................................................... 1-73
Fig. 82 State transitions of system clock ................................................................................. 1-74
Fig. 83 Digit timing waveform (1) .............................................................................................. 1-76
Fig. 84 Digit timing waveform (2) .............................................................................................. 1-77
Fig. 85 Pin connection of M38B79FF when operating in parallel input/output mode ........ 1-80
Fig. 86 Read timong .................................................................................................................... 1-81
Fig. 87 Timings during reading .................................................................................................. 1-82
Fig. 88 Input/output timings during programming (Verify data is output at the same timing as
for read.) ......................................................................................................................... 1-83
Fig. 89 Input/output timings during erasing (verify data is output at the same timing as for
read.) ................................................................................................................................1-84
Fig. 90 Programming/Erasing algorithm flow chart ................................................................. 1-86
Fig. 91 Pin connection of M38B79FF when operating in serial I/O mode .......................... 1-88
Fig. 92 Timings during reading .................................................................................................. 1-90
Fig. 93 Timings during programming ......................................................................................... 1-91
Fig. 94 Timings during program verify ...................................................................................... 1-91
Fig. 95 Timings at erasing .......................................................................................................... 1-92