N80C151SA 查看數據表（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

P3 0

P3 1

P3 3 2

P3 5 4

P3 6

P3 7

I O Port 3 This is an 8-bit bidirectional I O port with internal pullups

RXD

TXD

INT1 0

T1 0

WR

RD

PSEN

O Program Store Enable Read signal output This output is asserted

for a memory address range that depends on bits RD0 and RD1 in

configuration byte UCONFIG0

RD

O Read Read signal output to external data memory

P3 7

RST

I

Reset Reset input to the chip Holding this pin high for 64 oscillator

periods while the oscillator is running resets the device The port pins

are driven to their reset conditions when a voltage greater than VIH1 is

applied whether or not the oscillator is running This pin has an

internal pulldown resistor which allows the device to be reset by

connecting a capacitor between this pin and VCC

Asserting RST when the chip is in idle mode or powerdown mode

returns the chip to normal operation

RXD

I O Receive Serial Data RXD sends and receives data in serial I O

mode 0 and receives data in serial I O modes 1 2 and 3

P3 0

T1 0

I

Timer 1 0 External Clock Inputs When timer 1 0 operates as a

counter a falling edge on the T1 0 pin increments the count

P3 5 4

T2

I O Timer 2 Clock Input Output For the timer 2 capture mode this

signal is the external clock input For the clock-out mode it is the

timer 2 clock output

P1 0

T2EX

I

Timer 2 External Input In timer 2 capture mode a falling edge

initiates a capture of the timer 2 registers In auto-reload mode a

falling edge causes the timer 2 registers to be reloaded In the up-

down counter mode this signal determines the count direction

1 e up 0 e down

P1 1

TXD

O Transmit Serial Data TXD outputs the shift clock in serial I O mode

P3 1

0 and transmits serial data in serial I O modes 1 2 and 3

VCC

VCC2

PWR

PWR

Supply Voltage Connect this pin to the a5V supply voltage

Secondary Supply Voltage 2 This supply voltage connection is

provided to reduce power supply noise Connection of this pin to the

a5V supply voltage 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)

VPP

I

Programming Supply Voltage The programming supply voltage is

EA

applied to this pin for programming the on-chip OTPROM

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)

10

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