CY545 Stepper System Controller
www.ControlChips.com
DIP
PLCC
Pin Name
Description
16
17
18
19
(O)
(O)
WR/
RD/
Write strobe
Read strobe
These strobes are active while the CY545 is reading from the external
thumbwheel switches, display, or memory, or while it is writing to the
external display or memory.
DIP
18
19
PLCC
20
21
Pin Name
XTAL2
XTAL1
Description
Crystal connection
Crystal connection
(I)
(I)
An external crystal or clock source is connected to these pins, with a
value between 3.5 MHz and 16 MHz. For serial communications, an 11
MHz crystal will give standard baud rates.
DIP
PLCC
Pin Name
Description
20
-
22
23
(I)
(O)
VSS
NC
Power supply ground.
No connection
DIP
PLCC
Pin Name
Description
21
22
23
24
25
26
27
28
24
25
26
27
28
29
30
31
(I/O) USRB0
(I/O) USRB1
(I/O) USRB2
(I/O) USRB3
(I/O) USRB4
(I/O) USRB5
(I/O) USRB6
(I/O) USRB7
User selectable function, bit 0
User selectable function, bit 1
User selectable function, bit 2
User selectable function, bit 3
User selectable function, bit 4
User selectable function, bit 5
User selectable function, bit 6 or FPL/ or CTS/
User selectable function, bit 7 or HP_SEL/
This group of signals is used for multiple, user selectable functions,
including bit set and clear, bit test and branch, wait for signal value, and
auto home functions. Any function may be performed on any bit. Bits 6
and 7 also have fixed alternative functions of CY233 FPL control and
local parallel HP display selection if these features are used with the
CY545. If the application does not use a CY233, CTS/, or HP display,
these bits may be used for any other functions.
DIP
PLCC
Pin Name
Description
29
30
32
33
(O)
(O)
RESERVED
ALE
Reserved signal, not used by CY545
Address latch enable
The ALE signal is used to demultiplex the lower byte address from the
data bus during external memory, display, or thumbwheel switch
operations.
DIP
PLCC
Pin Name
Description
-
31
34
35
(O)
(I)
NC
TEST
No connection
Internal test signal, connect to Vcc.
© 2002 Cybernetic Micro Systems
9
Chapter 2 - Pinout & Package Overview
ETC [ ETC ]
