參數(shù)資料
型號: M37160M8-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.86 MHz, MICROCONTROLLER, PDIP42
封裝: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁數(shù): 120/133頁
文件大?。?/td> 1003K
代理商: M37160M8-XXXSP
Rev.1.01
2003.11.13
page 85 of 130
M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP
8.13 CLOCK GENERATING CIRCUIT
This microcomputer contains two internal oscillator circuits, one os-
cillator circuit for the main clock and XCIN-XCOUT for the subclock.
The main clock and OSD clock are generated based on the refer-
ence clock from the FSCIN pin. The subclock can be obtained by
connecting a resonator between XCIN and XCOUT to configure an
oscillator circuit. Because the resistance-capacitance time constants
vary with each resonator, be sure to use the value recommended by
the resonator manufacturer. The subclock can also be supplied di-
rectly from the FSCIN pin. For the FILT pin used to generate the
main clock, insert the filter shown in Figure 8.13.1. Because no resis-
tors are included between XCIN and XCOUT, please insert feedback
resistors external to the chip.
After reset, the internal clock f is derived from f(XIN) by dividing it by 2.
Immediately after power-on, the XIN and XCIN clocks both start oscil-
lating. To select low-speed mode for the internal clock f, set the CPU
Mode Register bit 7 to 1.
When operate system clock generating circuit at using standard clock
from FSCIN, set bit 0 of clock control register 1 (address 00CD16) to
“0.”
Fig.8.13.1 Ceramic Resonator Circuit Example
XCIN
FSCIN
CCIN
Microcomputer
XCOUT
Rf
Rd
CCOUT
FILT
External input
C1
0.01
F
0.01
F
XCIN/XCOUT
f(XIN)
f(OSC)
FSCIN
(4.43MHz)
Inside system
clock of switch circuit
f(XCIN)
Main clock
Clock for OSD
Sub clock
"1"
"0"
CC2 address 021116 bit 2
"0"
CM address 00FB16 bit 7(CM7)
Generating circuit
system clock
32kHz of
oscillation circuits
f (
Φ)
f(XIN) = 8.86 MHz f(OSC) = 26.58 MHz at 4.43 MHz oscillation frequency
Fig.8.13.2 clock generation circuit
相關(guān)PDF資料
PDF描述
M37160MA-XXXSP 8-BIT, MROM, 8.86 MHz, MICROCONTROLLER, PDIP42
M37160MF-XXXFP 8-BIT, MROM, 8.86 MHz, MICROCONTROLLER, PDSO42
M37160MA-XXXFP 8-BIT, MROM, 8.86 MHz, MICROCONTROLLER, PDSO42
M37160MF-XXXFP 8-BIT, MROM, 8.86 MHz, MICROCONTROLLER, PDSO42
M37161MA-XXXFP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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