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N87C51GB Datasheet(PDF) 5 Page - Intel Corporation |
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N87C51GB Datasheet(HTML) 5 Page - Intel Corporation |
5 / 22 page 8XC51GB This pin also receives the 1275V programming sup- ply voltage (VPP) during programming (OTP only) XTAL1 Input to the inverting oscillator amplifier XTAL2 Output from the inverting oscillator amplifi- er AD CONVERTER The 8XC51GB AD converter has a resolution of 8 bits and an accuracy of g1 LSB (g2 LSB for chan- nels 0 and 1) The conversion time for a single chan- nel is 20 ms at a clock frequency of 16 MHz with the sample and hold function included Independent supply voltages are provided for the AD Also the AD operates both in Normal Mode or in Idle Mode The AD has 8 analog input pins ACH0 (AD CHan- nel 0) ACH7 1 reference input pin COMPREF (COMParison REFerence) 1 control input pin TRI- GIN (TRIGger IN) and 2 power pins AVREF (Volt- age REFerence) and analog ground (ANalog GrouND) In addition the AD has 8 conversion re- sult registers ADRES0 (AD result for channel 0) ADRES7 1 comparison result register ACMP (Ana- log Comparison) and 1 control register ACON (AD Control) The control bit ACE (AD Conversion Enable) in ACON controls whether the AD is in operation or not ACE e 0 idles the AD ACE e 1 enables AD conversion The control bit AIM (AD Input mode) in ACON controls the mode of channel selection AIM e 0 is the Scan Mode and AIM e 1 is the Select Mode The result registers ADRES4 ADRES7 al- ways contain the result of a conversion from the cor- responding channels ACH4 CH7 However the result registers ADRES0 ADRES3 depend on the mode selected In the scan mode ADRES0 AD- RES3 contain the values from ACH0 ACH3 In the Select Mode one of the four channels ACH0 ACH3 is converted four times and the four values are stored sequentially in locations ADRES0 AD- RES3 Its channel is selected by bits ACS1 and ACS0 (AD Channel Select 1 and 0) in ACON PROGRAMMABLE COUNTER ARRAYS The Programmable Counter Arrays (PCA – PCA1) are each made up of a Counter Module and five Regis- terComparator Modules as shown below The 16-bit output of the counter module is available to all five RegisterComparator Modules providing one common timing reference Each RegisterCompara- tor Module is associated with a pin of Port 1 or Port 4 and is capable of performing input capture output compare and pulse width modulation functions The PCAs are exactly the same in function except for the addition of clock input sources on PCA1 The PCA Counter and five RegisterComparator Modules each have a status bit in the CCON C1CON Special Function Registers These six status bits are set according to the selected modes of operation described below The CCONC1CON Register provides a convenient means to determine which of the six PCAPCA1 interrupts has occurred The EC Bit in the IE (Interrupt Enable) Special Func- tion Register is a global interrupt enable for the PCA 272337 – 3 Figure 3 Programmable Counter Arrays OSCILLATOR CHARACTERISTICS XTAL1 and XTAL2 are the input and output respec- tively of an inverting amplifier which can be config- ured for use as an on-chip oscillator as shown in Figure 4 Either a quartz crystal or ceramic resonator may be used More detailed information concerning the use of the on-chip oscillator is available in Appli- cation Note AP-155 ‘‘Oscillators for Microcontrol- lers’’ Order No 230659 To drive the device from an external clock source XTAL should be driven while XTAL2 floats as shown in Figure 5 There are no requirements on the duty cycle of the external clock signal since the in- put to the internal clocking circuitry is through a di- vide-by-two flip-flop but minimum and maximum high and low times specified on the data sheet must be observed 5 |
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