80CL410 Datasheet, PDF (5/28 Pages) NXP Semiconductors – Low voltage/low power single-chip 8-bit microcontroller with I2C

Philips Semiconductors
Low voltage/low power single-chip
8-bit microcontroller with I²C
Product specification
80CL410/83CL410
PIN DESCRIPTION
MNEMONIC
PIN NO.
QFP
DIL40/
VSO40
V_SS
16
20
V_DD
38
40
P0.0–0.7
30–37
39–32
P1.0–P1.7
40–44
1–8
1–3
P2.0–P2.7
18–25
7
8
1–8
21–28
P3.0–P3.7
5, 7–13
10–17
RST
ALE
PSEN
8
12
9
13
10
14
11
15
12
16
13
17
4
9
27
30
26
29
EA
XTAL1
XTAL2
29
31
15
19
14
18
TYPE
NAME AND FUNCTION
I Ground: 0V reference.
I Power Supply: This is the power supply voltage for normal, idle, and power-down
operation.
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.
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: I_IL). Additional functions
include:
I/O SCL (P1.6): I²C serial bus clock.
I/O SDA (P1.7): I²C serial bus data.
I INT2–INT9 (P1.0–P1.7): Additional external interrupts.
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: I_IL). 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.
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: I_IL). Port 3 also serves the
special features of the 80C51 family, as listed below:
I INT0 (P3.2): External interrupt 0
I INT1 (P3.3): External interrupt 1
I T0 (P3.4): Timer 0 external input
I T1 (P3.5): Timer 1 external input
O WR (P3.6): External data memory write strobe
O RD (P3.7): External data memory read strobe
I Reset: A high on this pin for two machine cycles while the oscillator is running, resets
the device. An internal diffused resistor to V_SS permits a power-on reset using only an
external capacitor to V_DD.
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, and can be used for external timing or clocking. Note
that one ALE pulse is skipped during each access to external data memory.
O 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.
I External Access Enable: EA must be externally held low to enable the device to
fetch code from external program memory locations 0000H to 0FFFH. If EA is held
high, the device executes from internal program memory unless the program counter
contains an address greater than 0FFFH.
I Crystal 1: Input to the inverting oscillator amplifier and input for an external clock
source.
O Crystal 2: Output from the inverting oscillator amplifier.
1995 Jan 20
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