N80C151SA 데이터 시트보기 (PDF) - Intel

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N80C151SA

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

8XC151SA SB HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Table 7 Signal Descriptions (Continued)

Signal

Name

Type

Description

Multiplexed

With

VSS

VSS1

GND

GND

Circuit Ground Connect this pin to ground

Secondary Ground This ground is provided to reduce ground bounce

and improve power supply bypassing Connection of this pin to ground

is recommended However when using the 8XC151SA SB as a pin-

for-pin replacement for the 8XC51BH VSS1 can be unconnected

without loss of compatibility (Not available on DIP)

VSS2

GND

Secondary Ground 2 This ground is provided to reduce ground

bounce and improve power supply bypassing Connection of this pin to

ground is recommended However when using the 8XC151SA SB as

a pin-for-pin replacement for the 8XC51FX VSS2 can be unconnected

without loss of compatibility (Not available on DIP)

WR

O Write Write signal output to external memory

P3 6

XTAL1

I

Input to the On-chip Inverting Oscillator Amplifier To use the

internal oscillator a crystal resonator circuit is connected to this pin If

an external oscillator is used its output is connected to this pin XTAL1

is the clock source for internal timing

XTAL2 O Output of the On-chip Inverting Oscillator Amplifier To use the

internal oscillator a crystal resonator circuit is connected to this pin If

an external oscillator is used leave XTAL2 unconnected

The descriptions of A15 8 P2 7 0 and AD7 0 P0 7 0 are for the nonpage-mode chip configuration (compatible with

44-lead PLCC and 40-pin DIP MCS 51 microcontrollers) If the chip is configured for page-mode operation port 0 carries

the lower address bits (A7 0) and port 2 carries the upper address bits (A15 8) and the data (D7 0)

11

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