CY325 ETC, CY325 Datasheet - Page 14

• Manufacturer Part Number: CY325
• Description: Stepper System Controller
• Manufacturer: ETC

DIP
16
17
DIP
18
19
DIP
20
-
DIP
21
22
23
24
25
26
27
28
DIP
29
30
DIP
-
31
© 2002 Cybernetic Micro Systems
PLCC
18
19
PLCC
20
21
PLCC
22
23
PLCC
24
25
26
27
28
29
30
31
PLCC
32
33
PLCC
34
35
(O)
(O)
(I)
(I)
(I)
(O)
(I/O)
(I/O)
(I/O)
(I/O)
(I/O)
(I/O)
(I/O)
(I/O)
(O)
(O)
(O)
(I)
Pin Name
WR/
RD/
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.
Pin Name
XTAL2
XTAL1
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.
Pin Name
VSS
NC
Pin Name
USRB0
USRB1
USRB2
USRB3
USRB4
USRB5
USRB6
USRB7
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.
Pin Name
RESERVED
ALE
The ALE signal is used to demultiplex the lower byte address from the
data bus during external memory, display, or thumbwheel switch
operations.
Pin Name
NC
TEST
Description
Write strobe
Read strobe
Description
Crystal connection
Crystal connection
Description
Power supply ground.
No connection
Description
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/
Description
Reserved signal, not used by CY545
Address latch enable
Description
No connection
Internal test signal, connect to Vcc.
9
Chapter 2 - Pinout & Package Overview
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