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| 型號(hào)： | 935260531512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 25/67頁(yè) |
| 文件大?。?/td> | 400K |
| 代理商： | 935260531512 |
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1998 Apr 07
31
Philips Semiconductors
Product specication
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
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