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P87CL881H Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer P87CL881H
Beschreibung Low-voltage microcontroller with 63-kbyte OTP program memory and 2-kbyte RAM
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
P87CL881H Datasheet, Funktion
INTEGRATED CIRCUITS
DATA SHEET
P87CL881H
Low-voltage microcontroller with
63-kbyte OTP program memory
and 2-kbyte RAM
Product specification
File under Integrated Circuits, IC17
1999 Apr 16






P87CL881H Datasheet, Funktion
Philips Semiconductors
Low-voltage microcontroller with 63-kbyte
OTP program memory and 2-kbyte RAM
Product specification
P87CL881H
5.2 Pin description
Table 1 LQFP package
SYMBOL
VDD
VDDP
VSS
VSSP
RST
PORENABLE/VPP
EW
XTAL2
XTAL1
PSEN
ALE
EA
PIN DESCRIPTION
39 Power supply for core.
38 Power supply for I/O ring.
17 Ground for core.
16 Ground for I/O ring.
4 RESET. A LOW level on this pin for two machine cycles while the oscillator is running,
resets the device. The RST pin is also an output which can be used to reset other ICs.
6 PORENABLE. If set to a logic 1, the internal Power-on reset circuit is enabled. If external
reset circuitry is used, it is recommended to keep PORENABLE LOW in order to achieve
the lowest power consumption. This pin is also used for the OTP programming voltage
VPP.
28 Enable Watchdog Timer.
14 Crystal output. Output of the amplitude controlled oscillator. If an external oscillator
clock is used this pin not used.
15 Crystal input. Input to the amplitude controlled oscillator. Also the input for an externally
generated clock source.
26 Program Store Enable. Read strobe to external program memory. When executing
code out of external program memory, PSEN is activated twice each machine cycle.
However, during each access to external data memory two PSEN activations are
skipped. During Power-down mode the PSEN pin stays HIGH.
27 Address Latch Enable. Latches the low byte of the address during accesses to external
memory. It is activated every six oscillator periods and may be used for external timing or
clocking purposes. For improved EMC behaviour, the toggle of the ALE pin can be
disabled by setting the RFI bit in the PCON register by software. This bit is cleared on
reset and can be set and cleared by software. When set, the ALE pin will be pulled-down
internally, switching an external address latch to a quiet state. The MOVX instruction will
still toggle ALE if external memory is accessed. ALE will retain its normal HIGH state
during Idle mode and a LOW state during the Power-down mode while in the EMC mode.
Additionally, during internal access (EA = 1) ALE will toggle normally when the address
exceeds the internal program memory size. During external access (EA = 0) ALE will
always toggle normally, whether the RFI bit is set or not.
29 External Access. When EA is held HIGH, the CPU executes out of the internal program
memory (unless the program counter exceeds the highest address for internal program
memory). When EA is held LOW, the CPU executes out of external program memory
regardless of the value of the program counter. The state of the EA pin is internally
latched at reset.
1999 Apr 16
6

6 Page









P87CL881H pdf, datenblatt
Philips Semiconductors
Low-voltage microcontroller with 63-kbyte
OTP program memory and 2-kbyte RAM
Product specification
P87CL881H
handbook, full pagewidth
Q
from port latch
input data
this diode is not
implemented
on the I2C-bus pins
VDD
VDD external
I/O pin
external
pull-up
n
VSS
VSS
a. Open-drain.
MBK004
handbook, full pagewidth
1 oscillator
period
strong pull-up
p1
p2
VDD
p3
Q
from port latch
input data
n
VSS
IN1
b. Standard/quasi-bidirectional.
I/O pin
VSS
MBK001
handbook, full pagewidth
this diode is not
implemented
on the I2C-bus pins
VDD
input data
I/O pin
handbook, full pagewidth
Q
from port latch
input data
1999 Apr 16
VSS
MBK002
c. High-impedance.
strong pull-up
VDD
VDD
p
I/O pin
n
VSS
VSS
d. Push-pull.
Fig.3 Port configuration options.
MBK003
12

12 Page





SeitenGesamt 30 Seiten
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