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參數(shù)資料
| 型號： | ST63E69D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR |
| 中文描述： | 8位HCMOS單片機(jī)的數(shù)控多FREQUENCYMONITOR |
| 文件頁數(shù)： | 26/71頁 |
| 文件大?。?/td> | 584K |
| 代理商： | ST63E69D1 |
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ON-CHIPCLOCK OSCILLATOR
The internal oscillatorcircuit is designed to require
a minimum of external components. A crystal
quartz, a ceramic resonator, or an external signal
(provided to theOSCINpin) maybeusedto gener-
ate a system clockwith variousstability/cost trade-
offs. The typical clock frequency is 8MHz. Please
note that different frequencieswill affect theopera-
tion of those peripherals (D/As, SPI) whose refer-
encefrequenciesarederived fromthesystemclock.
The different clock generator options connection
methodsare shownin Figures 23 and 24. Onema-
chine cycle takes 13 oscillator pulses; 12 clock
pulses are needed to increment the PC while and
additional13thpulseis neededto stabilizethe inter-
nal latchesduring memoryaddressing.This means
thatwith aclockfrequencyof 8MHz the machinecy-
cle is 1.625
μ
Sec.
The crystal oscillator start-up time is a function of
manyvariables:crystal parameters(especially RS),
oscillatorloadcapacitance(CL),ICparameters,am-
bienttemperature,andsupplyvoltage.Itmustbeob-
served that the crystal or ceramic leads and circuit
connections must be as short as possible. Typical
valuesfor CL1 and CL2are in the range of 15pFto
22pFbuttheseshouldbechosenbasedonthecrys-
talmanufacturersspecification.Typicalinputcapaci-
tanceforOSCINandOSCOUT pins is 5pF.
The oscillatoroutputfrequencyis internallydivided
by 13 to produce the machine cycle and by 12 to
produce theTimerand the Watchdogclock.A byte
cycle is the smallest unit needed to execute any
operation (i.e.,incrementtheprogramcounter).An
instruction may need two, four, or five byte cycles
to beexecuted (See Table 7).
Instruction Type
Cycles
Execution
Time
Branch if set/reset
5 Cycles
8.125
μ
s
Branch & SubroutineBranch
4 Cycles
6.50
μ
s
Bit Manipulation
4 Cycles
6.50
μ
s
Load Instruction
4 Cycles
6.50
μ
s
Arithmetic & Logic
4 Cycles
6.50
μ
s
Conditional Branch
2 Cycles
3.25
μ
s
Program Control
2 Cycles
3.25
μ
s
Table 7. Intructions Timing with 8MHz Clock
Figure 23. Clock Generator Option (1)
Figure 24. Clock Generator Option (2)
Figure 25. OSCIN,OSCOUT Diagram
ST6369
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