83C754 Philips Semiconductors, 83C754 Datasheet - Page 4

• Manufacturer Part Number: 83C754
• Description: 80C51 8-bit microcontroller family 4K/256 OTP/ROM/ DAC/ comparator/ UART/ reference
• Manufacturer: Philips Semiconductors

1. AV
Philips Semiconductors
PIN DESCRIPTION
NOTE:
1998 Apr 23
V
V
P1.0–P1.2
P3.0–P3.7
RST
X1
X2
AV
AV
ZIN
YIN
XIN
XYZRAMP
DECOUPLE
VREG
XYDACBIAS
XYSOURCE
ZDAC
XYDAC
MNEMONIC
SS
CC
80C51 8-bit microcontroller family
4K/256 OTP/ROM, DAC, comparator, UART, reference
in the range 4.5V to 5.5V.
CC
SS
SS
1
1
(reference ground) must be connected to 0V (ground). AV
21, 23, 24
PIN NO.
25–28
1–4,
DIP
22
24
23
21
14
13
10
12
15
16
17
18
19
20
11
8
3
1
4
2
5
7
6
9
TYPE
I/O
I/O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Circuit Ground Potential.
Supply voltage during normal, idle, and power-down operation.
Port 1: Port 1 is a 3-bit bidirectional I/O port with internal pull-ups on P1.0 and P1.1. Port 1 pins that
have 1s written to them can be used as inputs. As inputs, port 1 pins that are externally pulled low will
source current because of the internal pull-ups (P1.0, P1.1). (See DC Electrical Characteristics: I
Port 1 also serves the special function features listed below (Note: P1.0 does not have the strong
pullup that is on for 2 oscillator periods.):
INT0 (P1.0): External interrupt 0.
CEX (P1.1): PCA clock output.
V
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to
them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are
externally being pulled low will source current because of the pull-ups. (See DC Electrical
Characteristics: I
programmed (or verified). (Note: P3.5 does not have the strong pullup that is on for 2 oscillator
periods.)
Port 3 also serves the special function as listed below:
ECI (P3.6): External PCA clock input.
RxD/T0 (P3.4): Serial port receiver data input.
INT1: External interrupt 1.
TxD/T1 (P3.5): Serial port transmitter data.
Reset: A high on this pin for two machine cycles while the oscillator is running resets the device. After
the device is reset, a 10-bit serial sequence, sent LSB first, applied to RESET, places the device in the
programming state allowing programming address, data and V
verification purposes. The RESET serial sequence must be synchronized with the X1 input. (Note: The
83/87C754 does not have an internal reset resistor.)
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. X1
also serves as the clock to strobe in a serial bit stream into RESET to place the device in the
programming state.
Crystal 2: Output from the inverting oscillator amplifier.
Analog supply voltage and reference input.
Analog supply and reference ground.
ZIN: Input to analog multiplexer.
YIN: Input to analog multiplexer.
XIN: Input to analog multiplexer.
XYZRAMP: Provides a low impedance pulldown to V
Decouple: Output from regulated supply for connection of decoupling capacitors.
VREG: Provides regulated analog supply output.
XYDACBIAS: Provides source voltage for bias of external circuitry.
XYSOURCE: Provides source voltage from regulated analog supply.
ZDAC: Switchable outp from the internal DAC.
ASEL (P0.0) – Input which indicates which bits of the EPROM address are applied to port 3.
ASEL = 0 low address byte available on port 3.
ASEL = 1 high address byte available on port 3 (only the three least significant bits are used).
XYDAC: Non-switchable output from the internal DAC.
PP
(P1.2): Programming voltage input (open drain).
– Input which specifies verify mode (output enable) or the program mode.
IL
Timer 0 external clock input.
Timer 1 external clock input.
). Port 3 also functions as the data input for the EPROM memory location to be
/PGM = 1 output enabled (verify mode).
/PGM = 0 program mode.
CC
(reference input) cannot differ from V
4
NAME AND FUNCTION
SS
under S/W control.
PP
to be applied for programming or
CC
by more than 0.2V, and must be
83C754/87C754
Preliminary specification
IL
).