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P87C52SFAA Datasheet(PDF) 5 Page - NXP Semiconductors

Part # P87C52SFAA
Description  8-bit CMOS (low voltage, low power and high speed) microcontroller families
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87C52SFAA Datasheet(HTML) 5 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
1999 Apr 01
5
PIN DESCRIPTIONS
PIN NUMBER
MNEMONIC
DIP
LCC
QFP
TYPE
NAME AND FUNCTION
VSS
20
22
16
I
Ground: 0V reference.
VCC
40
44
38
I
Power Supply: This is the power supply voltage for normal, idle, and power-down operation.
P0.0–0.7
39–32
43–36
37–30
I/O
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 and received code bytes during EPROM
programming. External pull-ups are required during program verification.
P1.0–P1.7
1–8
2–9
40–44,
1–3
I/O
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: IIL). Port 1 also receives the low-order address byte
during program memory verification.
Alternate functions for 8XC51FX and 8XC51RX+ Port 1 include:
1
2
40
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout (see Programmable Clock-Out)
2
3
41
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
3
4
42
I
ECI (P1.2): External Clock Input to the PCA
4
5
43
I/O
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
5
6
44
I/O
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
6
7
1
I/O
CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
7
8
2
I/O
CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
8
9
3
I/O
CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
P2.0–P2.7
21–28
24–31
18–25
I/O
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: IIL). Port 2 emits the high-order 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. Some Port 2 pins
receive the high order address bits during EPROM programming and verification.
P3.0–P3.7
10–17
11,
13–19
5,
7–13
I/O
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: IIL). Port 3 also serves the special features of the 80C51
family, as listed below:
10
11
5
I
RxD (P3.0): Serial input port
11
13
7
O
TxD (P3.1): Serial output port
12
14
8
I
INT0 (P3.2): External interrupt
13
15
9
I
INT1 (P3.3): External interrupt
14
16
10
I
T0 (P3.4): Timer 0 external input
15
17
11
I
T1 (P3.5): Timer 1 external input
16
18
12
O
WR (P3.6): External data memory write strobe
17
19
13
O
RD (P3.7): External data memory read strobe
RST
9
10
4
I
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the
device. An internal diffused resistor to VSS permits a power-on reset using only an external
capacitor to VCC.
ALE/PROG
30
33
27
O
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. ALE can be disabled by
setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction.


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