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S83C752-1DB Datasheet(PDF) 7 Page - NXP Semiconductors

Part # S83C752-1DB
Description  80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8 bit A/D, I2C, PWM, low pin count
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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Philips Semiconductors
Product specification
83C752/87C752
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8 bit A/D, I2C, PWM, low pin count
1998 May 01
7
P1.X
LATCH
DQ
CL
Q
READ
LATCH
INT. BUS
WRITE TO
LATCH
READ
PIN
ALTERNATE INPUT
FUNCTION
VDD
P1.X
PIN
INTERNAL
PULL-UP
ALTERNATE
OUTPUT
FUNCTION
P0.X
LATCH
DQ
CL
Q
READ
LATCH
INT. BUS
WRITE TO
LATCH
READ
PIN
ALTERNATE INPUT
FUNCTION
P0.X
PIN
ALTERNATE
OUTPUT
FUNCTION
SU00306
Figure 1. Port Bit Latches and I/O Buffers
I/O Ports
The I/O pins provided by the 83C752 consist of port 0, port 1, and
port 3.
Port 0
Port 0 is a 5-bit bidirectional I/O port and includes alternate functions
on some pins of this port. Pins P0.3 and P0.4 are provided with
internal pullups while the remaining pins (P0.0, P0.1, and P0.2) have
open drain output structures. The alternate functions for port 0 are:
P0.0
SCL – the I2C bus clock
P0.1
SDA – the I2C bus data
P0.4
PWM – the PWM output
If the alternate functions, I2C and PWM, are not being used, then
these pins may be used as I/O ports.
Port 1
Port 1 is an 8-bit bidirectional I/O port whose structure is identical to
the 80C51, but also includes alternate input functions on all pins.
The alternate pin functions for port 1 are:
P1.0-P1.4 - ADC0-ADC4 - A/D converter analog inputs
P1.5 INT0 - external interrupt 0 input
P1.6 INT1 - external interrupt 1 input
P1.7 - T0 - timer 0 external input
If the alternate functions INT0, INT1, or T0 are not being used, these
pins may be used as standard I/O ports. It is necessary to connect
AVCC and AVSS to VCC and VSS, respectively, in order to use these
pins as standard I/O pins. When the A/D converter is enabled, the
analog channel connected to the A/D may not be used as a digital
input; however, the remaining analog inputs may be used as digital
inputs. They may not be used as digital outputs. While the A/D is
enabled, the analog inputs are floating.
Port 3
Port 3 is an 8-bit bidirectional I/O port whose structure is identical to
the 80C51. Note that the alternate functions associated with port 3
of the 80C51 have been moved to port 1 of the 83C752 (as
applicable). See Figure 1 for port bit configurations.
Counter/Timer Subsystem
The 8XC752 has one counter/timer called timer/counter 0. Its
operation is similar to mode 2 operation on the 80C51, but is
extended to 16 bits with 16 bits of autoload. The controls for this
counter are centralized in a single register called TCON.
A watchdog timer, called Timer I, is for use with the I2C subsystem.
In I2C applications, this timer is dedicated to time-generation and
bus monitoring of the I2C. In non-I2C applications, it is available for
use as a fixed time-base.
Interrupt Subsystem—Fixed Priority
The IP register and the 2-level interrupt system of the 80C51 are
eliminated. The interrupt structure is a seven-source, one-level
interrupt system similar to the 8XC751. Simultaneous interrupt
conditions are resolved by a single-level, fixed priority as follows:
Highest priority:
Pin INT0
Counter/timer flag 0
Pin INT1
PWM
Timer I
Serial I2C
Lowest priority:
ADC
The vector addresses are as follows:
Source
Vector Address
INT0
0003H
TF0
000BH
INT1
0013H
TIMER I
001BH
SIO
0023H
ADC
002BH
PWM
0033H
Interrupt Control Registers
The 80C51 interrupt enable register is modified to take into account
the different interrupt sources of the 8XC752.


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