參數(shù)資料
型號(hào)： UPD4990AC-A
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP14
封裝： DIP-14
文件頁(yè)數(shù)： 12/51頁(yè)
文件大小： 211K
代理商： UPD4990AC-A
– i –
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION ................................................................................................................. 1
1.1
FEATURE .................................................................................................................................. 1
1.2
PIN CONNECTION DIAGRAM (TOP VIEW) ........................................................................... 2
1.3
PIN FUNCTION ......................................................................................................................... 2
1.4
BLOCK DIAGRAM .................................................................................................................... 3
1.5
SHIFT REGISTER ..................................................................................................................... 4
1.6
TIME COUNTER ....................................................................................................................... 5
1.7
15 STAGES DIVIDER ............................................................................................................... 5
1.8
DATA INPUT/OUTPUT ............................................................................................................. 5
CHAPTER 2 FUNCTION SPECIFICATION ............................................................................................. 7
2.1
COMMAND SETTING ............................................................................................................... 7
2.1.1
Parallel Command Mode ............................................................................................................. 7
2.1.2
Serial Command Mode ................................................................................................................ 7
2.1.3
Caution of Command Setting ..................................................................................................... 9
2.2
COMMAND SPECIFICATION ................................................................................................. 11
2.2.1
Parallel Command Mode ........................................................................................................... 11
2.2.2
Serial Command Mode .............................................................................................................. 13
CHAPTER 3 ACCESS SEQUENCE ....................................................................................................... 19
3.1
HOW TO READ DATA OF CLOCK ........................................................................................ 19
3.2
HOW TO WRITE DATA OF CLOCK ...................................................................................... 21
CHAPTER 4 EXPLANATION OF ELECTRICAL CHARACTERISTICS ............................................... 23
4.1
CRYSTAL OSCILLATOR ........................................................................................................ 23
4.2
HOW TO ADJUST OSCILLATION FREQUENCY ................................................................. 23
4.3
OSCILLATION CHARACTERISTICS ..................................................................................... 23
4.3.1
Temperature Characteristics .................................................................................................... 24
4.3.2
Supply Voltage Characteristics ................................................................................................ 25
4.4
SUPPLY CURRENT CHARACTERISTICS ............................................................................ 25
CHAPTER 5 INTERFACE ...................................................................................................................... 27
5.1
POWER SUPPLY CIRCUIT .................................................................................................... 27
5.2
POWER FAIL CIRCUIT .......................................................................................................... 30
CHAPTER 6 APPLICATION CIRCUIT & SOFTWARE ......................................................................... 33
6.1
COM-75X (4 BIT SINGLE CHIP CPU)................................................................................. 33
6.2
COM-87AD (8 BIT SINGLE CHIP CPU) .............................................................................. 37
6.3
80 SERIES MULTI CHIP CPU ................................................................................................ 40
CHAPTER 7 CONVERTING
PD1990A TO PD4990A....................................................................... 43
7.1
SPECIFICATION DIFFERENCE ............................................................................................. 43
7.2
DIFFERENCE OF OSCILLATOR ........................................................................................... 44
APPENDIX
PD4990A SPECIFICATION .............................................................................................. 45
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