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參數(shù)資料
| 型號： | S1C63158D0A010P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, UUC53 |
| 封裝： | DIE-53 |
| 文件頁數(shù)： | 142/159頁 |
| 文件大?。?/td> | 1200K |
| 代理商： | S1C63158D0A010P |
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S1C63808 TECHNICAL MANUAL
EPSON
75
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Serial Interface)
4.10.4 Clock source
There are four clock sources and selection is made by setting the two bits of the clock source selection
register SCSx0 and SCSx1 as shown in table below.
Table 4.10.4.1 Clock source
SCSx1
1
0
SCSx0
1
0
1
0
Clock source
Programmable timer
fOSC3 / 4
fOSC3 / 8
fOSC3 / 16
This register setting is invalid in clock synchronous slave mode and the external clock input from the
SCLKx terminal is used.
When the "programmable timer" is selected, the programmable timer 1 underflow signal is divided by 4
and this signal used as the clock source. With respect to the transfer rate setting, see "4.9 Programmable
Timer". At initial reset, the synchronous clock is set to "fOSC3/16".
Whichever clock is selected, the signal is further divided by 1/16 and then used as the synchronous clock.
Furthermore, external clock input is used as is for SCLKx in clock synchronous slave mode.
fOSC3
1/4
1/8
1/16
Synchro-
nous clock
Programmable timer 1
underflow signal
SCLKx
(Clock synchronous slave mode)
Divider
Selector
1/4
OSC3
oscillation
circuit
Fig. 4.10.4.1 Division of the synchronous clock
Table 4.10.4.2 shows an examples of transfer rates and OSC3 oscillation frequencies when the clock source
is set to programmable timer.
Table 4.10.4.2 OSC3 oscillation frequencies and transfer rates
Transfer rate
(bps)
9,600
4,800
2,400
1,200
600
300
150
75
fOSC3 = 3.072 MHz
PTPS1x
0 (1/1)
2 (1/32)
RLD1x
04H
09H
13H
27H
4FH
9FH
09H
13H
When the demultiplied signal of the OSC3 oscillation circuit is made the clock source, it is necessary to
turn the OSC3 oscillation ON, prior to using the serial interface.
A time interval of 5 msec, from the turning ON of the OSC3 oscillation circuit to until the oscillation
stabilizes, is necessary, due to the oscillation element that is used. Consequently, you should allow an
adequate waiting time after turning ON of the OSC3 oscillation, before starting transmitting/receiving of
serial interface. (The oscillation start time will vary somewhat depending on the oscillator and on the
externally attached parts. Refer to the oscillation start time example indicated in Chapter 7, "Electrical
Characteristics".)
At initial reset, the OSC3 oscillation circuit is set to OFF status.
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