P89C669 查看數據表（PDF） - Philips Electronics

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P89C669

80C51 8-bit microcontroller family with extended memory; 96 kB Flash with 2 kB RAM

Philips Electronics 

Philips Semiconductors

P89C669

80C51 8-bit microcontroller family with extended memory

Table 3:

Symbol

XTAL2

VSS

VDD

Pin description…continued

Pin

Type

PLCC LQFP

20

14

O

22

16

I

44

38

I

(NC/VSS) 1

39

I

(NC/VDD) 23

17

I

Description

Crystal 2: Output from the inverting oscillator amplifier.

Ground: 0 V reference.

Power Supply: This is the power supply voltage for normal operation as well as

Idle and Power-down modes.

No Connect/Ground: This pin is internally connected to VSS on the P89C669. If

connected externally, this pin must only be connected to the same VSS as at

pin 22. (Note: Connecting the second pair of VSS and VDD pins is not required.

However, they may be connected in addition to the primary VSS and VDD pins to

improve power distribution, reduce noise in output signals, and improve

system-level EMI characteristics.)

No Connect/Power Supply: This pin is internally connected to VDD on the

P89C669. If connected externally, this pin must only be connected to the same

VDD as at pin 44. (Note: Connecting the second pair of VSS and VDD pins is not

required. However, they may be connected in addition to the primary VSS and

VDD pins to improve power distribution, reduce noise in output signals, and

improve system-level EMI characteristics.)

9397 750 12299

Product data

Rev. 02 — 13 November 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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