P89C660 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

P89C660

80C51 8-bit Flash microcontroller family

Philips Electronics 

Philips Semiconductors

80C51 8-bit Flash microcontroller family

16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM

Product data

P89C660/P89C662/P89C664/

P89C668

PIN NUMBER

MNEMONIC

PLCC LQFP

TYPE

NAME AND FUNCTION

EA/VPP

XTAL1

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.

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.

2002 Oct 28

8

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