83C749 Datasheet, PDF (9/22 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count

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 AV_CC and AV_SS. This means that the reference
voltage on the A/D cannot be varied separately from the analog
supply pins. AV_SS must be connected to 0V and AV_CC 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
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