Datasheet > M80C51FB

M80C51FB

更新时间： 2022-11-26 15:35:33

品牌	Logo	应用领域
英特尔 - INTEL		微控制器
页数	文件大小	规格书
12页	186K
描述
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

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M80C51FB 数据手册

M80C51FB

Port 0: Port 0 is an 8-bit, open drain, bidirectional I/O

port. As an output port each pin can sink several LS

TTL inputs. Port 0 pins that have 1’s written to them

float, and in that state can be used as high-imped-

ance inputs.

DIP

Port 0 is also the multiplexed low-order address and

data bus during accesses to external Program and

Data Memory. In this application it uses strong inter-

nal pullups when emitting1’s, and can source and

sink several LS TTL inputs.

Port 1: Port 1 is an 8-bit bidirectional I/O port with

internal pullups. The Port 1 output buffers can drive

LS TTL inputs. Port 1 pins that have 1’s written to

them are pulled high by the internal pullups, and in

that state can be used as inputs. As inputs, Port 1

pins that are externally being pulled low will source

current (I , on the data sheet) because of the inter-

nal pullups.

In addition, Port 1 serves the functions of the follow-

ing special features of the M80C51FB:

Port Pin

Alternate Function

271172–2

P1.0

T2 (External Count Input to Timer/

Counter 2)

LCC/Gull Wing/J-Lead

P1.1

T2EX (Timer/Counter 2 Capture/

Reload Trigger and Direction Control)

P1.2

P1.3

ECI (External Count Input to the PCA)

CEX0 (External I/O for Compare/

Capture Module 0)

P1.4

P1.5

P1.6

P1.7

CEX1 (External I/O for Compare/

Capture Module 1)

CEX2 (External I/O for Compare/

Capture Module 2)

CEX3 (External I/O for Compare/

Capture Module 3)

CEX4 (External I/O for Compare/

Capture Module 4)

Port 2: Port 2 is an 8-bit bidirectional I/O port with

internal pullups. The Port 2 output buffers can drive

LS TTL inputs. Port 2 pins that have 1’s written to

them are pulled high by the internal pullups, and in

that state can be used as inputs. As inputs, Port 2

pins that are externally being pulled low will source

271172–3

Figure 2. M80C51FB Pin Connections

PIN DESCRIPTIONS

current (I , on the data sheet) because of the inter-

nal pullups.

V : Supply voltage.

V : Circuit ground.

1 234 5 6 7...12

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