P89C668 datasheet(8/89 Pages) PHILIPS

tên linh kiện	P89C668

Giải thích chi tiết về linh kiện	80C51 8-bit Flash microcontroller family

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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

MNEMONIC

NAME AND FUNCTION

TYPE

PIN NUMBER

MNEMONIC

NAME AND FUNCTION

TYPE

LQFP

PLCC

EA/VPP

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

Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator

circuits.

XTAL2

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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