參數(shù)資料
型號(hào)： 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(jī)的小型通用紅外遙控器
文件頁(yè)數(shù)： 17/94頁(yè)
文件大?。?/td> 763K
代理商： KS57C2504
S3C7254
PRODUCT SPECIFICATION
4–17
OSCILLATOR CIRCUITS
The S3C7254 microcontroller have two oscillator
circuits: a main system clock circuit, and a
subsystem clock circuit. The main system clock
frequencies can be divided by 4, 8, or 64 by
manipulating PCON bits 1 and 0.
The system clock mode control register, SCMOD,
lets you select a
main system clock (fx)
or a
subsystem clock (fxt)
as the CPU clock and to start
(or stop) main system clock oscillation.
The watch timer, buzzer and LCD display operate
normally with a subsystem clock source, since they
operate at very slow speeds and with very low
power consumption (as low as 122 μs at 32.768
kHz).
Xin
Xout
OSCILLATOR
STOP
CPU
CLOCK
WAIT RELEASE SIGNAL
PCON.3,2 CLEAR
fxt
SELECTOR
fx
WATCH
TIMER
fxx
CPU STOP SIGNAL
(IDLE MODE)
LCD
CONTROLLER
IDLE
STOP
LCD CONTROLLER
BASIC TIMER
TIMER/COUNTERS 0
SERIAL I/O INTERFACE
WATCH TIMER
CLOCK OUTPUT CIRCUIT
Xin
Xout
SUBSYSTEM
OSCILLATOR
CIRCUIT
MAIN SYSTEM
OSCILLATOR
CIRCUIT
SCMOD.3
SCMOD.0
FREQUENCY
DIVIDING
CIRCUIT
1/2
1/16
SELECTOR
PCON.3
POWER-DOWN RELEASE SIGNAL
INTERNAL
RESET
SIGNAL
PCON.0
PCON.2
PCON.1
OSCILLATOR
CONTROL
CIRCUIT
1/4
Figure 16. Clock Circuit Diagram
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