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參數(shù)資料
| 型號： | KS57C2504 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 20/94頁 |
| 文件大?。?/td> | 763K |
| 代理商： | KS57C2504 |
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PRODUCT SPECIFICATION
S3C7254
4–20
INSTRUCTION CYCLE TIMES
The unit of time that equals one machine cycle
varies depending on whether the main system clock
(fx) or a subsystem clock (fxt) is used, and on how
the oscillator clock signal is divided (by 4, 8, or 64).
Table 5 shows corresponding cycle times in
microseconds.
Table 5. Instruction Cycle Times for CPU Clock Rates
Selected
CPU Clock
fx/64
fx/8
fx/4
Resulting Frequency
Oscillation
Source
fx = 4.19 MHz
Cycle Time (μsec)
65.5 kHz
524.0 kHz
1.05 MHz
15.3
1.91
0.95
fxt/4
8.19 kHz
fxt = 32.768 kHz
122.0
SYSTEM CLOCK MODE REGISTER (SCMOD)
The system clock mode register, SCMOD, is a 4-bit
register that is used to select the CPU clock and to
control main system clock oscillation. Only its least
significant and most significant bits can be
manipulated by 1-bit write instructions.
Subsystem clock oscillation cannot, of course, be
stopped internally. Also, if you have selected fx as
the CPU clock, setting SCMOD.3 to "1" will not stop
main system clock oscillation. This can only be done
by a STOP instruction.
Table 6. System Clock Mode Register (SCMOD) Organization
SCMOD Register Bit Settings
SCMOD.3
0
0
1
Resulting Clock Selection
CPU Clock
fx
fxt
fxt
SCMOD.0
0
1
1
fx Oscillation
On
On
Off
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