參數(shù)資料
型號(hào)： P87C554SFBD
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
中文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP64
封裝： 10 X 10 X 1.40 MM, PLASTIC, LQFP-64
文件頁(yè)數(shù)： 23/76頁(yè)
文件大小： 400K
代理商： P87C554SFBD
Philips Semiconductors
Preliminary specification
80C554/83C554/87C554
80C51 8-bit microcontroller – 6 clock operation
16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, 64L LQFP
2000 Nov 10
23
I
PWM0
f
OSC
8-BIT COMPARATOR
8-BIT COUNTER
8-BIT COMPARATOR
PWM1
PRESCALER
OUTPUT
BUFFER
PWMP
OUTPUT
BUFFER
PWM0
PWM1
SU01448
Figure 19. Functional Diagram of Pulse Width Modulated Outputs
INTERNAL BUS
10-BIT A/D CONVERTER
ANALOG INPUT
MULTIPLEXER
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
+
–
STADC
ANALOG REF.
ANALOG SUPPLY
ANALOG GROUND
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADCON
ADCH
SU01467
Figure 20. Functional Diagram of Analog Input Circuitry
10-Bit Analog-to-Digital Conversion:
Figure 21 shows the
elements of a successive approximation (SA) ADC. The ADC
contains a DAC which converts the contents of a successive
approximation register to a voltage (VDAC) which is compared to
the analog input voltage (Vin). The output of the comparator is fed to
the successive approximation control logic which controls the
successive approximation register. A conversion is initiated by
setting ADCS in the ADCON register. ADCS can be set by software
only or by either hardware or software.
The software only start mode is selected when control bit ADCON.5
(ADEX) = 0. A conversion is then started by setting control bit
ADCON.3 (ADCS). The hardware or software start mode is selected
when ADCON.5 = 1, and a conversion may be started by setting
ADCON.3 as above or by applying a rising edge to external pin
STADC. When a conversion is started by applying a rising edge, a
low level must be applied to STADC for at least one machine cycle
followed by a high level for at least one machine cycle.
相關(guān)PDF資料
PDF描述
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