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參數資料
| 型號： | P87LPC761 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low power, low price, low pin count (16 pin) microcontroller with 2 kbyte OTP |
| 中文描述： | 低功耗，低價格，低引腳數（16針）2字節檢察官辦公室微控制器 |
| 文件頁數： | 25/58頁 |
| 文件大小： | 299K |
| 代理商： | P87LPC761 |
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Philips Semiconductors
Preliminary data
P87LPC761
Low power, low price, low pin count (16 pin)
microcontroller with 2 kbyte OTP
2002 Mar 07
22
Oscillator
The P87LPC761 provides several user selectable oscillator options,
allowing optimization for a range of needs from high precision to
lowest possible cost. These are configured when the EPROM is
programmed. Basic oscillator types that are supported include: low,
medium, and high speed crystals, covering a range from 20 kHz to
20 MHz; ceramic resonators; and on-chip RC oscillator.
Low Frequency Oscillator Option
This option supports an external crystal in the range of 20 kHz to
100 kHz.
Table 5 shows capacitor values that may be used with a quartz
crystal in this mode.
Table 5. Recommended oscillator capacitors for use with the low frequency oscillator option
V
DD
= 2.7 to 4.5 V
Frequency
Lower Limit
Optimal Value
Oscillator
V
DD
= 4.5 to 6.0 V
Optimal Value
Upper Limit
Lower Limit
Upper Limit
20 kHz
15 pF
15 pF
33 pF
33 pF
33 pF
47 pF
32 kHz
15 pF
15 pF
33 pF
33 pF
33 pF
47 pF
100 kHz
15 pF
15 pF
33 pF
15 pF
15 pF
33 pF
Medium Frequency Oscillator Option
This option supports an external crystal in the range of 100 kHz to
4 MHz. Ceramic resonators are also supported in this configuration.
Table 6 shows capacitor values that may be used with a quartz
crystal in this mode.
Table 6. Recommended oscillator capacitors for use with the medium frequency oscillator option
Oscillator Freq ency
Oscillator Frequency
V
DD
= 2.7 to 4.5 V
Optimal Value
Lower Limit
Upper Limit
100 kHz
33 pF
33 pF
47 pF
1 MHz
15 pF
15 pF
33 pF
4 MHz
15 pF
15 pF
33 pF
High Frequency Oscillator Option
This option supports an external crystal in the range of 4 to 20 MHz.
Ceramic resonators are also supported in this configuration.
Table 7 shows capacitor values that may be used with a quartz
crystal in this mode.
Table 7. Recommended oscillator capacitors for use with the high frequency oscillator option
V
DD
= 2.7 to 4.5 V
Frequency
Lower Limit
Optimal Value
Oscillator
V
DD
= 4.5 to 6.0 V
Optimal Value
Upper Limit
Lower Limit
Upper Limit
4 MHz
15 pF
33 pF
47 pF
15 pF
33 pF
68 pF
8 MHz
15 pF
15 pF
33 pF
15 pF
33 pF
47 pF
16 MHz
–
–
–
15 pF
15 pF
33 pF
20 MHz
–
–
–
15 pF
15 pF
33 pF
On-Chip RC Oscillator Option
The on-chip RC oscillator option has a typical frequency of 6 MHz
and can be divided down for slower operation through the use of the
DIVM register. For on-chip oscillator tolerance see Electrical
Characteristics table. A clock output on the X2/P2.0 pin may be
enabled when the on-chip RC oscillator is used.
External Clock Input Option
In this configuration, the processor clock is input from an external
source driving the X1/P2.1 pin. The rate may be from 0 Hz up to
20 MHz when VDD is above 4.5 V and up to 10 MHz when VDD is
below 4.5 V. When the external clock input mode is used, the
X2/P2.0 pin may be used as a standard port pin. A clock output on
the X2/P2.0 pin may be enabled when the external clock input is
used.
Clock Output
The P87LPC761 supports a clock output function when either the
on-chip RC oscillator or external clock input options are selected.
This allows external devices to synchronize to the P87LPC761.
When enabled, via the ENCLK bit in the P2M1 register, the clock
output appears on the X2/CLKOUT pin whenever the on-chip
oscillator is running, including in Idle mode. The frequency of the
clock output is 1/6 of the CPU clock rate. If the clock output is not
needed in Idle mode, it may be turned off prior to entering Idle,
saving additional power. The clock output may also be enabled
when the external clock input option is selected.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| P87LPC761BDH | 功能描述:8位微控制器 -MCU 2K/128 OTP 2.7-6V COMM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| P87LPC761BDH,112 | 功能描述:8位微控制器 -MCU 2K/128 OTP 2.7-6V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| P87LPC761BN | 功能描述:8位微控制器 -MCU 2K/128 OTP 2.7-6V COMM DIP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| P87LPC761BN,112 | 功能描述:8位微控制器 -MCU 2K/128 OTP 2.7-6V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| P87LPC762 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
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