參數(shù)資料
型號(hào): VS1003
廠商: Electronic Theatre Controls, Inc.
元件分類: Codec
英文描述: MP3 / WMA AUDIO CODEC
中文描述: MP3播放/ WMA音頻編解碼器
文件頁數(shù): 47/57頁
文件大小: 456K
代理商: VS1003
VLSI
Solution
y
VS1003 PRELIMINARY
VS1003
10. VS1003 REGISTERS
10.11
UART
v1.0 2002-04-23
RS232 UART implements a serial interface using rs232 standard.
Start
bit
D0
D1
D2
D3
D4
D5
D6
D7
Stop
bit
Figure 15: RS232 Serial Interface Protocol
When the line is idling, it stays in logic high state. When a byte is transmitted, the transmission begins
with a start bit (logic zero) and continues with data bits (LSB first) and ends up with a stop bit (logic
high). 10 bits are sent for each 8-bit byte frame.
10.11.1
Registers
UART registers, prefix UARTx
Type
Reset
Abbrev
r
0
STATUS[3:0]
r/w
0
DATA[7:0]
r/w
0
DATAH[15:8]
r/w
0
DIV
Reg
Description
Status
Data
Data High
Divider
0xC028
0xC029
0xC02A
0xC02B
10.11.2
Status UARTx STATUS
A read from the status register returns the transmitter and receiver states.
UARTx STATUS Bits
Bits
Description
3
Receiver overrun
2
Receiver data register full
1
Transmitter data register full
0
Transmitter running
Name
UART ST RXORUN
UART ST RXFULL
UART ST TXFULL
UART ST TXRUNNING
UART ST RXORUN is set if a received byte overwrites unread data when it is transferred from the
receiver shift register to the data register, otherwise it is cleared.
UART ST RXFULL is set if there is unread data in the data register.
UART ST TXFULL is set if a write to the data register is not allowed (data register full).
UART ST TXRUNNING is set if the transmitter shift register is in operation.
Version 0.92,
2005-06-07
47
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