參數(shù)資料
型號(hào)： P89C738ABB
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-bit Flash microcontrollers
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 31/64頁
文件大?。?/td> 360K
代理商： P89C738ABB
1998 Apr 07
31
Philips Semiconductors
Product specification
8-bit Flash microcontrollers
P89C738; P89C739
14 OSCILLATOR CIRCUIT
The oscillator circuit of the P89C738 is a single-stage
inverting amplifier in a Pierce oscillator configuration.
The circuitry between the XTAL 1 and XTAL 2 is basically
an inverter biased to the transfer point. Either a crystal or
ceramic resonator can be used as the feedback element to
complete the oscillator circuitry (see Fig.19).
Both are operated in parallel resonance. XTAL 1 is the
high gain amplifier input, and XTAL 2 is the output (see
Fig.18).
To drive the P89C738 externally, XTAL 1 is driven from an
external source and XTAL 2 left open-circuit (see Fig.20).
Fig.18 P89C738/P89C739 oscillator internal circuit.
handbook, full pagewidth
MGK196
400
XTAL1
XTAL2
Q1
Q3
Q4
to internal
timing circuits
D1
D2
Q2
PO
VSS
VDD
R1
Fig.19 P89C738/P89C739 oscillator circuit
with crystal/ceramic resonator.
handbook, halfpage
C1
20 pF
C2
MBK775
20 pF
XTAL1
XTAL2
Fig.20 Driving the P89C738/P89C739 from an
external source.
handbook, halfpage
MGK197
CMOS gate
external
oscillator
signal
XTAL1
VSS
XTAL2
NC
相關(guān)PDF資料
PDF描述
P89C738ABP 8-bit Flash microcontrollers
P89C739 8-bit Flash microcontrollers
P89LPC904 8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter
P89LPC904FD 8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter
P89LPC9102 8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89C738ABP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit Flash microcontrollers
P89C738BBB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
P89C739 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit Flash microcontrollers
P89C739ABA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit Flash microcontrollers
P89C739ABB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit Flash microcontrollers
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