參數(shù)資料
型號(hào)： TC9324F
廠商： Toshiba Corporation
英文描述： Single-Chip DTS Microcontroller (DTS-20)
中文描述： 單芯片微丘（丘- 20）
文件頁(yè)數(shù)： 27/101頁(yè)
文件大?。?/td> 1831K
代理商： TC9324F
TC9324F
2002-02-08
27
System Clock Control Circuit
The system clock control circuitry consists of a clock generator, an oscillation detector, an oscillation
control port, a timing generator, and a backup mode control circuit.
4.5 MHz oscillator: CI
=
30 pF, CO
=
30 pF (typ.)
75 kHz oscillator: CI
=
30 pF, CO
=
30 pF, R
=
0
(typ.)
Note: Select a crystal oscillator with a low CI value and good startup characteristics.
Note: Determine the constants for external resistors and capacitors in accordance with the crystal oscillator
actually used.
Note: Fix to GND level the input pin (XIN1 or XIN2) of any oscillator that is not connected to a crystal oscillator.
Note: The 4.5 MHz and 75 kHz oscillators incorporate Schmitt trigger circuits.
. Clock Generator and Oscillation Detector
The clock generator is a circuit to generate a reference clock supplied to the CPU core and peripheral
hardware. The TC9324F incorporates both 4.5 MHz and 75 kHz oscillators. Connect the 4.5 MHz oscillator
to the XIN1 and XOUT1 pins and the 75 kHz oscillator to the XIN2 and XOUT2 pins.
The oscillation detector detects the clocks for the 4.5 MHz and 75 kHz oscillators and selects which to use
as the reference clock. If clocks for both oscillators are detected, the clock for the 4.5 MHz oscillator is
selected as the reference clock.
Accordingly, either one or both oscillators (4.5 MHz and 75 kHz) can be connected. Note that an input pin
(XIN1 or XIN2) that is not connected to an oscillator must be fixed to GND level. If both the 75 kHz and 4.5
MHz oscillators are connected, after a reset the CPU operates on the 4.5 MHz crystal oscillator clock.
The clock can be readily switched by software between the CPU operating clock and the peripheral clock.
75 kHz
oscillator
Clock generator
CO
75 kHz
XOUT2
CI
XIN2
4.5 MHz
oscillator
CO
4.5 MHz
XOUT1
CI
XIN1
Oscillation
detector
Oscillation control port
(
φ
L1AP2)
Backup mode control
circuit
Timing generator
CPU clock
Peripheral clock
94
95
97
98
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