P83C749 查看數據表（PDF） - Philips Electronics

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P83C749

80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count

Preliminary specification

83C749/87C749

may always be used as digital inputs. Unselected analog inputs will

be floating and may not be used as digital outputs.

The A/D reference inputs on the 8XC749 are tied together with the

analog supply pins AVCC and AVSS. This means that the reference

voltage on the A/D cannot be varied separately from the analog

supply pins. AVSS must be connected to 0V and AVCC must be

connected to a supply voltage between 4.5V and 5.5V. A/D

measurements may be made in the range of 4.5V to 5.5V.

Increasing the voltage on the A/D ground reference above 0V or

reducing the voltage on the positive A/D reference below 4.5V is not

permitted.

Table 2. 8XC749 Special Function Registers

SYMBOL

DESCRIPTION

DIRECT

BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION

ADDRESS MSB

LSB

RESET

VALUE

ACC*

Accumulator

E0H

E7

E6

E5

E4

E3

E2

E1

E0 00H

ADAT# A/D result

84H

00H

ADCON# A/D control

A0H

–

– ENADC ADCI ADCS AADR2 AADR1 AADR0 C0H

B*

B register

F0H

F7

F6

F5

F4

F3

F2

F1

F0 00H

DPTR:

Data pointer

(2 bytes)

DPL

Data pointer low

82H

00H

DPH

Data pointer high

83H

00H

AF

AE

AD

AC

AB

AA

A9

A8

IE*#

Interrupt enable

ADH

EA EAD ETI

— EPWM EX1

ET0

EX0 00H

–

–

–

84

83

82

81

80

P0*#

Port 0

80H

–

–

–

PWM0

–

–

–

– xxx11111B

97

96

95

94

93

92

91

90 FFH

P1*#

Port 1

90H

T0 INT1 INT0 ADC4 ADC3 ADC2 ADC1 ADC0

P3*

Port 3

B0H

B7

B6

B5

B4

B3

B2

B1

B0 FFH

PCON# Power control

87H

–

–

–

–

–

–

PD

IDL xxxx0000B

D7

D6

D5

D4

D3

D2

D1

D0

PSW*

Program status word

D0H

CY

AC

F0

RS1

RS0

OV

–

P 00H

PWCM# PWM compare

8EH

xxxxxxxxB

PWENA# PWM enable

FEH

–

–

–

–

–

–

–

PWE FEH

PWMP# PWM prescaler

8FH

00H

RTL#

Timer low reload

8BH

00H

RTH#

Timer high reload

8DH

00H

SP

Stack pointer

81H

07H

TL#

Timer low

8AH

00H

TH#

Timer high

8CH

00H

DF

DE

DD

DC

DB

DA

D9

D8

TICON*# Timer I control

D8H/RD

–

–

0

TIRUN

–

–

–

– 0000xx00B

WR

–

–

CLRTI TIRUN

–

–

–

–

8F

8E

8D

8C

8B

8A

89

88

TCON*# Timer control

88H

GATE C/T

TF

TR

IE0

IT0

IE1

IT1 00H

* SFRs are bit addressable.

# SFRs are modified from or added to the 80C51 SFRs.

1998 Apr 23

9

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