參數(shù)資料
型號(hào)： P87LPC764FN,112
廠商： NXP Semiconductors
文件頁數(shù)： 16/60頁
文件大?。?/td> 0K
描述： IC 80C51 MCU 4K OTP 20-DIP
產(chǎn)品培訓(xùn)模塊： Migrating from 8/16-Bit MCUs to 32-Bit ARMs
標(biāo)準(zhǔn)包裝： 18
系列： LPC700
核心處理器： 8051
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，LED，POR，WDT
輸入/輸出數(shù)： 18
程序存儲(chǔ)器容量： 4KB（4K x 8）
程序存儲(chǔ)器類型： OTP
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 6 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-DIP（0.300"，7.62mm）
包裝： 管件
其它名稱： 568-3215-5
935266845112
P87LPC764FN
Philips Semiconductors
Product data
P87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
22
Oscillator
The P87LPC764 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
Oscillator
VDD = 2.7 to 4.5 V
VDD = 4.5 to 6.0 V
Frequency
Lower Limit
Optimal Value
Upper Limit
Lower Limit
Optimal Value
Upper Limit
20 kHz
15 pF
33 pF
47 pF
32 kHz
15 pF
33 pF
47 pF
100 kHz
15 pF
33 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 Fre-
VDD = 2.7 to 4.5 V
VDD = 4.5 to 6.0 V
quency
Lower Limit
Optimal Value
Upper Limit
Lower Limit
Optimal Value
Upper Limit
100 kHz
33 pF
47 pF
33 pF
47 pF
1 MHz
15 pF
33 pF
15 pF
22 pF
47 pF
4 MHz
15 pF
33 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
Oscillator
VDD = 2.7 to 4.5 V
VDD = 4.5 to 6.0 V
Frequency
Lower Limit
Optimal Value
Upper Limit
Lower Limit
Optimal Value
Upper Limit
4 MHz
15 pF
33 pF
47 pF
15 pF
33 pF
68 pF
8 MHz
15 pF
33 pF
15 pF
33 pF
47 pF
16 MHz
–
15 pF
33 pF
20 MHz
–
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 AC 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 P87LPC764 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 P87LPC764.
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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