HT37B90/HT37B70/HT37B50/HT37B30
IIS Function
D/A Converter Interface
the right channel, and a ²L² state is used for the left
channel.
The device provides the IIS serial data format to support
the multiple D/A converters, one bit clock output and a
word clock signal for left/right stereo serial data trans-
mission.
CK Description
CK bit clock is the clock source for the signal. which can
accept the IIS serial data format.
Clock Signal
DT:Stereo Serial Data Format Transmit
The bit clock output signals DCK are used to synchro-
nize the IIS serial data. The word clock signal LOAD di-
vides the serial data into left channel and right channel
data for two-way audio output.
The audio output data is in serial mode with 16 bit digital
signal and LSB first output. There is a high sampling
rate of 50kHz when the fOSC is 12.8MHz and with two
channel outputs for Right/Left channel. The device pro-
vides only one serial data format as IIS mode. The user
could directly connect a D/A converter which can accept
the IIS serial data format.
WAS Description
The word clock signal WAS is used for IIS serial data.
The stereo serial data consists of 16-channel sound
generator. On IIS format, a ²H² state on WAS is used for
D/A Converter Timing
UART Bus Serial Interface
The device contains an integrated full-duplex asynchronous serial communications. The UART function can transmit
and receive data serially by transferring a frame of data with eight per transmission. The UART function possesses its
own internal interrupt which can be used to indicate when a reception occurs or when a transmission terminates. If the
UART Clock always generates 31.25kHz, the value of BRGR should correspond to fOSC
.
Register Name
RS232C
TXD
Bit7
¾
Bit6
¾
Bit5
PH
D5
Bit4
EN
D4
Bit3
¾
Bit2
Bit1
BE
D1
Bit0
BF
¾
D2
D2
D7
D7
D6
D6
D3
D3
D0
RXD
D5
D4
D1
D0
Note:
¾: No function, read only, read as 0.
BF: RX buffer full; 0: Buffer not full; 1: Buffer full (Default=0)
BE: TX buffer empty; 0: Buffer not empty; 1: Buffer empty (Default=1)
EN: Enable/disable RS232 function; 0: disable; 1: enable
PH: RS232 input Pull High control (Default=1)
0= disable; 1= enable
BRGR
Decimal
Bit7
Integer
Prescaler
Bit6
1
Bit5
0
Bit4
0
Bit3
0
Bit2
0
Bit1
Bit0
1
1
0
0
0
1
0
2
1
1
0
0
0
Rev. 1.00
60
June 22, 2017
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
