The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

OTHER MODES OF THE 8255Printer Signal

(cont

’)

Ground

18 - 25

Select input

17

Initialize printer

16

Error

15

Auto feed

14

Select

13

Out of paper

12

Busy

11

ACK (acknowledge)

10

Data bit 7

9

Data bit 6

8

Data bit 5

7

Data bit 4

6

Data bit 3

5

Data bit 2

4

Data bit 1

3

Data bit 0

2

Srtobe

1

Description

Table 15-2. DB-25 Printer PinsPin