4501 datasheet(9/212 Pages) RENESAS

9 / 212 page

4501 Group

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

List of figures

Fig. 41 Start condition identified example using the SNZP instruction ................................ 1-44

Fig. 42 Clock control circuit structure ....................................................................................... 1-47

Fig. 43 Switch to ceramic resonance/RC oscillation ............................................................... 1-48

Fig. 44 Handling of XIN and XOUT when operating on-chip oscillator .................................... 1-48

Fig. 45 Ceramic resonator external circuit ............................................................................... 1-48

Fig. 46 External RC oscillation circuit ....................................................................................... 1-48

Fig. 47 External clock input circuit ............................................................................................ 1-49

Fig. 48 Timer count start timing and count time when operation starts (T1, T2) ............... 1-50

Fig. 49 External 0 interrupt program example-1 ...................................................................... 1-51

Fig. 50 External 0 interrupt program example-2 ...................................................................... 1-51

Fig. 51 External 0 interrupt program example-3 ...................................................................... 1-51

Fig. 52 A/D conversion interrupt program example ................................................................ 1-52

Fig. 53 Analog input external circuit example-1 ...................................................................... 1-52

Fig. 54 Analog input external circuit example-2 ...................................................................... 1-52

Fig. 55 Flow of writing and test of the product shipped in blank ....................................... 1-104

Fig. 56 Pin configuration of built-in PROM version .............................................................. 1-105

CHAPTER 2 APPLICATION

Fig. 2.1.1 Key input by key scan ................................................................................................. 2-9

Fig. 2.1.2 Key scan input timing .................................................................................................. 2-9

Fig. 2.2.1 INT interrupt operation example .............................................................................. 2-16

Fig. 2.2.2 INT interrupt setting example ................................................................................... 2-17

Fig. 2.2.3 Timer 1 constant period interrupt setting example ................................................ 2-18

Fig. 2.2.4 Timer 2 constant period interrupt setting example ................................................ 2-19

Fig. 2.3.1 Peripheral circuit example ......................................................................................... 2-24

Fig. 2.3.2 Watchdog timer function ............................................................................................ 2-25

Fig. 2.3.3 Constant period measurement setting example ..................................................... 2-26

Fig. 2.3.4 CNTR output setting example .................................................................................. 2-27

Fig. 2.3.5 CNTR input setting example ..................................................................................... 2-28

Fig. 2.3.6 Timer start by external input setting example (1) ................................................. 2-29

Fig. 2.3.7 Timer start by external input setting example (2) ................................................. 2-30

Fig. 2.3.8 Watchdog timer setting example .............................................................................. 2-31

Fig. 2.3.9 Timer count start timing and count time when operation starts (T1, T2) ................ 2-32

Fig. 2.4.1 A/D converter structure ............................................................................................. 2-33

Fig. 2.4.2 A/D conversion mode setting example .................................................................... 2-35

Fig. 2.4.3 Analog input external circuit example-1 .................................................................. 2-36

Fig. 2.4.4 Analog input external circuit example-2 .................................................................. 2-36

Fig. 2.4.5 A/D converter operating mode program example .................................................. 2-36

Fig. 2.5.1 Structure of reset pin and its peripherals, and power-on reset operation ......... 2-38

Fig. 2.5.2 Oscillation stabilizing time after system is released from reset .......................... 2-38

Fig. 2.5.3 Internal state at reset ................................................................................................ 2-39

Fig. 2.6.1 Voltage drop detection circuit ................................................................................... 2-41

Fig. 2.6.2 Voltage drop detection circuit operation waveform example ............................... 2-41

Fig. 2.7.1 Start condition identified example ............................................................................ 2-43

Fig. 2.8.1 Switch to ceramic resonance/RC oscillation .......................................................... 2-49

Fig. 2.8.2 Handling of XIN and XOUT when operating on-chip oscillator ................................ 2-49

Fig. 2.8.3 Ceramic resonator external circuit ........................................................................... 2-50

Fig. 2.8.4 External RC oscillation circuit .................................................................................. 2-50

Fig. 2.8.5 Structure of clock control circuit .............................................................................. 2-51

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