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P89C668 数据表(PDF) 8 Page - NXP Semiconductors

部件名 P89C668
功能描述  80C51 8-bit Flash microcontroller family
PDF  89 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

P89C668 数据表(HTML) 8 Page - NXP Semiconductors

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Philips Semiconductors
Product data
P89C660/P89C662/P89C664/
P89C668
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
2002 Oct 28
8
MNEMONIC
NAME AND FUNCTION
TYPE
PIN NUMBER
MNEMONIC
NAME AND FUNCTION
TYPE
LQFP
PLCC
EA/VPP
35
29
I
External Access Enable/Programming Supply Voltage: EA must be externally held low to
enable the device to fetch code from external program memory locations. If EA is held high, the
device executes from internal program memory. The value on the EA pin is latched when RST
is released and any subsequent changes have no effect. This pin also receives the
programming supply voltage (VPP) during Flash programming.
XTAL1
21
15
I
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
XTAL2
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 (other than VPP) must not be higher than VCC + 0.5 V or less than VSS – 0.5 V.



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