CMX808AE3 CML Microcircuits, CMX808AE3 Datasheet - Page 4

• Manufacturer Part Number: CMX808AE3
• Description: Family Radio CTCSS Type 2 Encoder and Decoder
• Manufacturer: CML Microcircuits

Family Radio CTCSS 'Type 2' Encoder and Decoder
1.3
Pin No.
1999 Consumer Microcircuits Limited
E3
1
2
3
4
5
6
7
Package
Signal List
Pin No.
P4
1
2
3
4
5
6
7
XTALN
XTAL/CLOCK
SERIAL CLOCK
COMMAND DATA
REPLY DATA
CSN
IRQN
Name
Signal
Type
O/P
O/P
O/P
I/P
I/P
I/P
I/P
4
The inverted output of the on-chip oscillator.
The input to the on-chip oscillator, for external
Xtal circuit or clock.
The "C-BUS" serial clock input. This clock,
produced by the µController, is used for
transfer timing of commands and data to and
from the device. See "C-BUS" Timing Diagram
(Figure 4).
The "C-BUS" serial data input from the
µController. Data is loaded into this device in
8-bit bytes, MSB (D7) first, and LSB (D0) last,
synchronised to the SERIAL CLOCK. See
"C-BUS" Timing Diagram (Figure 4).
The "C-BUS" serial data output to the
µController. The transmission of REPLY DATA
bytes is synchronised to the SERIAL CLOCK
under the control of the CSN input. This 3-
state output is held at high impedance when
not sending data to the µController. See "C-
BUS" Timing Diagram (Figure 4).
The "C-BUS" data loading control function: this
input is provided by the µController. Data
transfer sequences are initiated, completed or
aborted by the CSN signal. See "C-BUS"
Timing Diagram (Figure 4).
This output indicates an interrupt condition to
the µController by going to a logic "0". This is a
"wire-ORable" output, enabling the connection
of up to 8 peripherals to 1 interrupt port on the
µController. This pin has a low impedance
pulldown to logic "0" when active and a high-
impedance when inactive. An external pullup
resistor is required.
An interrupt is effective if not masked out by
the IRQ MASK (bit 0 in the SUB-AUDIO
CONTROL register $80).
Description
CMX808A
D/808A/5