Exte�Nal C�Ystal/Ce�Ami - Holtek TinyPower HT69F40A Manual

HT69F30A/HT69F40A/HT69F50A
TinyPower I/O Flash 8-Bit MCU with LCD & EEPROM
TM
EEPROM Data Memory .................................................................................. 48
EEPR�M Registe�s .............................................................................................................. 4�
Reading Data f�om the EEPR�M ......................................................................................... �0
W�iting Data to the EEPR�M ................................................................................................ �0
W�ite P�ote�tion ..................................................................................................................... �0
EEPR�M Inte��upt ................................................................................................................ �0
P�og�amming Conside�ations ................................................................................................ �1
Oscillator ........................................................................................................ 52
�s�illato� �ve�view ............................................................................................................... �2
System Clock Configurations ................................................................................................ �2
Exte�nal C�ystal/Ce�ami� �s�illato� - HXT ........................................................................... �3
Exte�nal RC �s�illato� - ERC ............................................................................................... �4
Inte�nal RC �s�illato� - HIRC ............................................................................................... �4
Exte�nal 32.76�kHz C�ystal �s�illato� - LXT ........................................................................ ��
LXT �s�illato� Low Powe� Fun�tion ...................................................................................... �6
Inte�nal 32kHz �s�illato� - LIRC ........................................................................................... �6
Exte�nal Clo�k - EC .............................................................................................................. �6
Supplementa�y �s�illato�s .................................................................................................... �6
Operating Modes and System Clocks ......................................................... 57
System Clo�k ........................................................................................................................ �7
System �pe�ation Modes ...................................................................................................... ��
Cont�ol Registe� .................................................................................................................... �9
Fast Wake-up ........................................................................................................................ 61
�pe�ating Mode Swit�hing .................................................................................................... 61
�pe�ating Mode Swit�hing and Wake-up .............................................................................. 62
N�RMAL Mode to SL�W Mode Swit�hing ........................................................................... 63
SL�W Mode to N�RMAL Mode Swit�hing ........................................................................... 64
Ente�ing the SLEEP0 Mode .................................................................................................. 6�
Ente�ing the SLEEP1 Mode .................................................................................................. 6�
Ente�ing the IDLE0 Mode ...................................................................................................... 6�
Ente�ing the IDLE1 Mode ...................................................................................................... 66
Stand�y Cu��ent Conside�ations ........................................................................................... 66
Wake-up ................................................................................................................................ 67
P�og�amming Conside�ations ................................................................................................ 67
Watchdog Timer ............................................................................................. 68
Wat�hdog Time� Clo�k Sou��e .............................................................................................. 6�
Wat�hdog Time� Cont�ol Registe� ......................................................................................... 6�
Wat�hdog Time� �pe�ation ................................................................................................... 69
Reset and Initialisation .................................................................................. 70
Reset Fun�tions .................................................................................................................... 71
Reset Initial Conditions ......................................................................................................... 74
Rev. 1.20 3 ��to�e� 0�� 201�