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S87C652-4B44 Datasheet(PDF) 7 Page - NXP Semiconductors

Part # S87C652-4B44
Description  CMOS single-chip 8-bit microcontrollers
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

S87C652-4B44 Datasheet(HTML) 7 Page - NXP Semiconductors

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Phlips Semiconductors
Product specification
80C652/83C652
CMOS single-chip 8-bit microcontrollers
1996 Aug 15
7
PIN DESCRIPTIONS
PIN NUMBER
MNEMONIC
DIP
PLCC
QFP
TYPE
NAME AND FUNCTION
VSS
20
22
6, 16,
28, 39
I
Ground: 0V reference. With the QFP package all VSS pins (VSS1 to VSS4) must be
connected.
VDD
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.
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, except P1.6 and P1.7
which are open drain. 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). Alternate functions include:
P1.6
7
8
2
I/O
SCL: I2C-bus serial port clock line.
P1.7
8
9
3
I/O
SDA: I2C-bus serial port data line.
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.
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 VDD.
ALE
30
33
27
I/O
Address Latch Enable: 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. Note that one ALE pulse is skipped during each access to external
data memory.
PSEN
29
32
26
O
Program Store Enable: Read strobe to external program memory via Port 0 and Port 2. It
is activated twice each machine cycle during fetches from the external program memory.
When executing out of external program memory two activations of PSEN are skipped
during each access to external data memory. PSEN is not activated (remains HIGH) during
no fetches from external program memory. PSEN can sink/source 8 LSTTL inputs and can
drive CMOS inputs without external pull–ups.
EA
31
35
29
I
External Access: If during a RESET, EA is held at TTL, level HIGH, the CPU executes out
of the internal program memory ROM provided the Program Counter is less than 8192. If
during a RESET, EA is held a TTL LOW level, the CPU executes out of external program
memory. EA is not allowed to float.
XTAL1
19
21
15
I
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
XTAL2
18
20
14
O
Crystal 2: Output from the inverting oscillator amplifier.
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin at any time must not be higher than VDD + 0.5V or VSS – 0.5V, respectively.


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