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P89V662FA Datasheet(PDF) 9 Page - NXP Semiconductors

Part # P89V662FA
Description  8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

P89V662FA Datasheet(HTML) 9 Page - NXP Semiconductors

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P89V660_662_664_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 29 January 2008
9 of 89
NXP Semiconductors
P89V660/662/664
80C51 with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI
[1]
ALE loading issue: When ALE pin experiences higher loading (>30 pF) during the reset, the microcontroller may accidentally enter into
modes other than normal working mode. The solution is to add a pull-up resistor of 3 k
Ω to 50 kΩ to V
DD, e.g., for ALE pin.
[2]
For 6-clock mode, ALE is emitted at 1
3 of crystal frequency.
ALE/PROG
27
33
I/O
Address Latch Enable: ALE is the output signal for latching
the low byte of the address during an access to external
memory. This pin is also the programming pulse input (PROG)
for flash programming. Normally the ALE[1] is emitted at a
constant rate of 1
6 the crystal frequency
[2] and can be used for
external timing and clocking. One ALE pulse is skipped during
each access to external data memory. However, if AO is set to
‘1’, ALE is disabled.
XTAL1
15
21
I
Crystal 1: Input to the inverting oscillator amplifier and input to
the internal clock generator circuits.
XTAL2
14
20
O
Crystal 2: Output from the inverting oscillator amplifier.
VDD
38
44
I
Power supply
VSS
16
22
I
Ground
Table 3.
Pin description …continued
Symbol
Pin
Type
Description
TQFP44
PLCC44


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