P80C32EBBB PHILIPS [NXP Semiconductors], P80C32EBBB Datasheet - Page 7

• Manufacturer Part Number: P80C32EBBB
• Description: CMOS single-chip 8-bit microcontrollers
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
PIN DESCRIPTION
1996 Aug 16
MNEMONIC
V
V
P0.0–0.7
P1.0–P1.7
P2.0–P2.7
P3.0–P3.7
RST
ALE/PROG
PSEN
EA/V
XTAL1
XTAL2
SS
CC
CMOS single-chip 8-bit microcontrollers
PP
39–32
21–28
10–17
DIP
1–8
20
40
10
11
12
13
14
15
16
17
30
29
31
19
18
1
2
9
PIN NO.
43–36
24–31
13–19
LCC
2–9
11,
22
44
11
13
14
15
16
17
18
19
10
33
32
35
21
20
2
3
37–30
40–44
18–25
7–13
QFP
1–3
16
38
40
41
10
12
13
27
26
29
15
14
11
5,
5
7
8
9
4
TYPE
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
NAME AND FUNCTION
Ground: 0V reference.
Power Supply: This is the power supply voltage for normal, idle, and power-down
operation.
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to
them float and can be used as high-impedance inputs. Port 0 is also the multiplexed
low-order address and data bus during accesses to external program and data memory. In
this application, it uses strong internal pull-ups when emitting 1s. Port 0 also outputs the
code bytes during program verification in the 87C52. External pull-ups are required during
program verification.
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As
inputs, port 1 pins that are externally pulled low will source current because of the internal
pull-ups. (See DC Electrical Characteristics: I
receives the low-order address byte during program memory verification. Port 1 also serves
alternate functions for timer 2:
T2 (P1.0): Timer/counter 2 external count input.
T2EX (P1.1): Timer/counter 2 trigger input.
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As
inputs, port 2 pins that are externally being pulled low will source current because of the
internal pull-ups. (See DC Electrical Characteristics: I
address byte during fetches from external program memory and during accesses to
external data memory that use 16-bit addresses (MOVX @DPTR). In this application, it
uses strong internal pull-ups when emitting 1s. During accesses to external data memory
that use 8-bit addresses (MOV @Ri), port 2 emits the contents of the P2 special function
register.
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
the 80C51 family, as listed below:
RxD (P3.0): Serial input port
TxD (P3.1): Serial output port
INT0 (P3.2): External interrupt
INT1 (P3.3): External interrupt
T0 (P3.4): Timer 0 external input
T1 (P3.5): Timer 1 external input
WR (P3.6): External data memory write strobe
RD (P3.7): External data memory read strobe
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the
device. An internal diffused resistor to V
capacitor to V
Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the
address during an access to external memory. In normal operation, ALE is emitted at a
constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking.
Note that one ALE pulse is skipped during each access to external data memory. This pin is
also the program pulse input (PROG) during EPROM programming.
Program Store Enable: The read strobe to external program memory. When the device is
executing code from the external program memory, PSEN is activated twice each machine
cycle, except that two PSEN activations are skipped during each access to external data
memory. PSEN is not activated during fetches from internal program memory.
External Access Enable/Programming Supply Voltage: EA must be externally held low
to enable the device to fetch code from external program memory locations 0000H to
1FFFH. If EA is held high, the device executes from internal program memory unless the
program counter contains an address greater than 1FFFH. This pin also receives the
12.75V programming supply voltage (V
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
Crystal 2: Output from the inverting oscillator amplifier.
CC
.
7
PP
SS
) during EPROM programming.
permits a power-on reset using only an external
IL
IL
). Pins P1.0 and P1.1 also. Port 1 also
). Port 3 also serves the special features of
IL
). Port 2 emits the high-order
80C32/87C52
Product specification