參數(shù)資料
型號(hào)： IS89C51-24PLI
廠商： INTEGRATED SILICON SOLUTION INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 28/48頁(yè)
文件大小： 371K
代理商： IS89C51-24PLI
IS89C51
34
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98
ISSI
Table 10. Status of the External Pins During Idle and Power-down Modes.
Mode
Memory
ALE
PSEN
PORT 0
PORT 1
PORT 2
PORT 3
Idle
Internal
1
Data
Idle
External
1
Float
Data
Address
Data
Power-down
Internal
0
Data
Power-down
External
0
Float
Data
On-Chip Oscillators
The on-chip oscillator circuitry of the IS89C51 is a single
stage inverter, intended for use as a crystal-controlled,
positive reactance oscillator. In this application the crystal
is operated in its fundamental response mode as an
inductive reactance in parallel resonance with capacitance
external to the crystal (Figure 21). Examples of how to
drive the clock with external oscillator are shown in
Figure 22.
Figure 21. Oscillator Connections
The crystal specifications and capacitance values (C1 and
C2 in Figure 21) are not critical. 20 pF to 30 pF can be used
in these positions at a 12 MHz to 24 MHz frequency with
good quality crystals. (For ranges greater than 24 MHz
refer to Figure 23.) A ceramic resonator can be used in
place of the crystal in cost-sensitive applications. When a
ceramic resonator is used, C1 and C2 are normally selected
to be of somewhat higher values. The manufacturer of the
ceramic resonator should be consulted for recommendation
on the values of these capacitors.
GND
XTAL1
XTAL2
EXTERNAL
OSCILLATOR
SIGNAL
NC
Figure 22. External Clock Drive Configuration
C1
C2
GND
XTAL1
XTAL2
相關(guān)PDF資料
PDF描述
IS89C51-12PL 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQCC44
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IS89LV51-12PQ 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IS89C51-24PQ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
IS89C51-24PQI 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
IS89C51-24W 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH
IS89C51-24WI 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
IS89C5140PL 制造商:NA 功能描述:
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