CY545 Stepper System Controller
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© 2002 Cybernetic Micro Systems
Chapter 2 - Pinout & Package Overview
10
DIP
PLCC
Pin Name Description
32
36
(I/O)
D7
Parallel data bus, bit 7, MSB
33
37
(I/O)
D6
Parallel data bus, bit 6
34
38
(I/O)
D5
Parallel data bus, bit 5
35
39
(I/O)
D4
Parallel data bus, bit 4
36
40
(I/O)
D3
Parallel data bus, bit 3
37
41
(I/O)
D2
Parallel data bus, bit 2
38
42
(I/O)
D1
Parallel data bus, bit 1
39
43
(I/O)
D0
Parallel data bus, bit 0, LSB
This group is the parallel data bus, used to read or write parallel data.
During access to external thumbwheel switches, memory, or display, the
lower byte of the device address is presented on these lines just prior to
the data transfer. Parallel commands are also accepted by the CY545 on
these lines, using the handshake control signals. These lines are open
drain, so external pull-up resistors are required when they are used as
outputs.
DIP
PLCC
Pin Name Description
40
44
(I)
VCC
+5 Volt power supply input.