AK2363 Datasheet, PDF (22/33 Pages) Asahi Kasei Microsystems – Radio Signaling LSI

ASAHI KASEI
[AK2363]
MSK Modem Operation
1) MSK Modulator
The TX section of the modem interfaces with the Modulator by using the TCLK, TDATA, and MOD
pins and register data BS2, BS1, BS0 (referred to as BS[2:0]), and MSKTX as follows:
(1) Set MSKTX to 1 and BS[2:0] to mode 2, 4, or 6 to start MSK transmission.
(2) A 1200Hz or 2400Hz clock is output on the TCLK pin. In synchronization with the rising edge
of TCLK, the AK2363 reads MSK transmit data from the TDATA pin and outputs the
modulated MSK signal on the MOD pin.
(3) After as many bits as required have been transmitted, wait for two clock periods until the last bit of
the MSK signal has been transmitted.
(4) Then, set BS[2:0] to change from mode 2, 4, or 6 to mode 0,1, 3, or 5. Alternatively, set
MSKTX to 0 to end signal transmission.
MSKTX=1
And [ BS[2:0] = 010 (Mode 2)
or BS[2:0] = 100 (Mode 4)
or BS[2:0] = 110 (Mode 6)]
: Start MSK signal transmission.
In synchronization with clock on
TCLK pin, read data from
TDATA pin and transmit MSK
signal on MOD pin
No
Required bit
been transmitted?
Yes
Wait time
833ms or more (when MSKSL = 0)
1666ms or more (when MSKSL = 1)
MSKTX = 0 or
[ BS[2:0] = 000 (Mode 0)
or BS[2:0] = 001 (Mode 1)
or BS[2:0] = 011 (Mode 3)
or BS[2:0] = 101 (Mode 5)]
: MSK signal transmission in progress
: MSK data has been transmitted.
: End MSK signal transmission.
MS0583-E-01
- 22 -
2008/06