ASAHI KASEI
[AK2346B]
15. MSK MODEM Description
1) MSK Modulator control flow
MSK data transmitter, Modulator interfaces with TCLK, TDATA and MOD pins and also TXRX,
TXSW2 and TXSW1 register as below.
TXRX=0
TXSW2=0
: MSK data transmit start
TXSW1=1
MSK data are transmitted
synchronized to TCLK clock
: MSK data transmitting
N
Required bit
number completed
Y
Y
: MSK data transmit compete
TXSW2=1
Waiting 2ms or more
: Switching to audio signal
TXSW1=0
(1)
(2)
Setting TXRX=0, TXSW2=0 and TXSW1=1, MSK data transmit is provided.
A 1200/2400Hz clock is put out from TCLK pin. Synchronizing with the rising edge of TCLK,
AK2346B reads the MSK transmit data from TDATA pin and puts out them to MOD pin.
After transmitting the necessary bit number, please set TXSW2=1
Afterwards, before switching to audio signal mode, please wait for at least 2ms after setting
TXSW2=1 to complete sending the MSK data final data bit transmit. Then set TXSW1=1.
(3)
(4)
MS1409-E-00
2012/05
- 23 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
