N80C51GB-1 データシートの表示（PDF） - Intel

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N80C51GB-1

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Intel 

8XC51GB

This pin also receives the 12 75V programming sup-

ply voltage (VPP) during programming (OTP only)

XTAL1 Input to the inverting oscillator amplifier

XTAL2 Output from the inverting oscillator amplifi-

er

A D CONVERTER

The 8XC51GB A D 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 A D Also the

A D operates both in Normal Mode or in Idle Mode

The A D has 8 analog input pins ACH0 (A D 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 A D has 8 conversion re-

sult registers ADRES0 (A D result for channel 0)

ADRES7 1 comparison result register ACMP (Ana-

log Comparison) and 1 control register ACON (A D

Control)

The control bit ACE (A D Conversion Enable) in

ACON controls whether the A D is in operation or

not ACE e 0 idles the A D ACE e 1 enables A D

conversion The control bit AIM (A D 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 (A D 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-

ter Comparator Modules as shown below The

16-bit output of the counter module is available to all

five Register Comparator Modules providing one

common timing reference Each Register Compara-

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 Register Comparator

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 CCON C1CON

Register provides a convenient means to determine

which of the six PCA PCA1 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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