8
Register Set
8.1
Summary
Register Name
Direction
Offset
Decimal
Index
(Hex)
8255 Device #1 Port A Register ( see page 12)
Read/Write
0
-
8255 Device #1 Port B Register ( see page 12)
Read/Write
1
-
8255 Device #1 Port C Register ( see page 12)
Read/Write
2
-
8255 Device #1 Configuration Register ( see page 12)
Write
3
-
8255 Device #2 Port A Register ( see page 15)
Read/Write
4
-
8255 Device #2 Port B Register ( see page 15)
Read/Write
5
-
8255 Device #2 Port C Register ( see page 15)
Read/Write
6
-
8255 Device #2 Configuration Register ( see page 15)
Write
7
-
8254 Counter/Timer 0 Data ( see page 18)
Read/Write
8
-
8254 Counter/Timer 1 Data ( see page 18)
Read/Write
9
-
8254 Counter/Timer 2 Data ( see page 18)
Read/Write
10
-
8254 Counter/Timer Mode Configuration Register ( see page 18)
Write
11
-
8254 Counter/Timer Input Setup Low Byte Register ( see page 19)
Read/Write
12
-
8254 Counter/Timer Input Setup High Byte Register ( see page 19)
Read/Write
13
-
General Setup Low Byte Register ( see page 22)
Read/Write
14
-
General Setup High Byte Register ( see page 22)
Read/Write
15
-
8.2
8255 Device #1 Registers
Detailed register information for 8255 device #1. Both bit names and associated connector placement are shown where
applicable (i.e. ref.pin#).
Base + 0
8255 Device #1 Port A Register
Read/Write
D7
D6
D5
D4
D3
D2
D1
D0
1A7
1A6
1A5
1A4
1A3
1A2
1A1
1A0
Tracer Reference Manual
8.2 8255 Device #1 Registers
12
Friday, June 08, 2018
8
Summary of Contents for Tracer
Page 1: ......
Page 8: ...3 2 Photo Tracer Reference Manual 3 3 Tracer Block Diagram 4 Friday June 08 2018 3 ...
Page 38: ......