82C55A_06 Datasheet, PDF (17/29 Pages) Intersil Corporation – CMOS Programmable Peripheral Interface

82C55A
INTERRUPT
REQUEST
PC3 PA0
PA1
PA2
PA3
PA4
PA5
MODE 2 PA6
PA7
PC4
PC5
PC7
PC6
82C55A
PC2
PC1
PC0
D0
D1
D2
D3
FLOPPY DISK
CONTROLLER
D4
AND DRIVE
D5
D6
D7
DATA STB
ACK (IN)
DATA READY
ACK (OUT)
TRACK “0” SENSOR
SYNC READY
INDEX
PB0
PB1
PB2
MODE 0 ^PB3
(OUTPUT) PB4
PB5
PB6
PB7
ENGAGE HEAD
FORWARD/REV.
READ ENABLE
WRITE ENABLE
DISC SELECT
ENABLE CRC
TEST
BUSY LT
FIGURE 23. BASIC FLOPPY DISC INTERFACE
INTERRUPT
REQUEST
PC3 PA0
PA1
PA2
PA3
PA4
MODE 1 ^PA5
(INPUT) PA6
PA7
PC4
PC5
PC6
82C55A
PC0
MODE 0 _PC1
(INPUT) _PC2
R0
R1
R2
R3
B LEVEL
PAPER
R4
TAPE
R5 ^READER
R6
R7
STB
ACK
STOP/GO
MACHINE TOOL
START/STOP
LIMIT SENSOR (H/V)
OUT OF FLUID
PB0
PB1
PB2
MODE 0 ^PB3
(OUTPUT) PB4
PB5
PB6
PB7
CHANGE TOOL
LEFT/RIGHT
UP/DOWN
HOR. STEP STROBE
VERT. STEP STROBE
SLEW/STEP
FLUID ENABLE
EMERGENCY STOP
FIGURE 24. MACHINE TOOL CONTROLLER INTERFACE
17
FN2969.10
November 16, 2006