參數(shù)資料
型號： MC72000
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Integrated Bluetooth Radio
中文描述： 集成藍牙無線
文件頁數(shù)： 60/156頁
文件大?。?/td> 1782K
代理商： MC72000
60
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
MOTOROLA
Hardware Functional Description
before the receive FIFO has been completely filled. These early warnings allow relaxed interrupt response
times.
7.2.5.4.1
UART RXBUFFER Control Register (URXCON)
The RXLEVEL register is used to set the threshold for the interrupt that is generated when the receive buffer
is full. The RXFULLCNT register contains the number of bytes that are currently buffered in the receive
FIFO.
RXFULLCNT[5:0]—Receive buffer full level
This value indicates the number of bytes currently buffered in the receive FIFO buffer. The number of
bytes is between 0 (empty) and 32 (full) bytes.
RXLEVEL[5:0]—Receive buffer level
When the number of bytes in the receive FIFO exceeds the value specified by RXLEVEL, an interrupt
is generated.
7.2.5.4.2
UART TXBUFFER Control Register (UTXCON)
UTXCON sets the threshold for the interrupt that is generated when the transmit buffer becomes empty. The
TXEMPTYCNT register contains the number of bytes that can still be written to the UART transmit FIFO.
Data can be written to the transmit buffer while this number is non-zero.
TXEMPTYCNT[7:0]—Transmit Buffer Empty Level
This value indicates the number of empty bytes currently available in the transmit FIFO buffer. The
number of free bytes is between 0 (full) and 32 (empty) bytes.
URXCONBase + $00C
31
0
30
0
29
0
28
0
27
0
26
0
25
0
24
0
23
0
22
0
21
0
20
0
19
0
18
0
17
0
16
0
R
W
RST
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
4
3
2
1
0
R
W
RXFULLCNT
RXLEVEL
0
RST
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= writes have no effect and terminate without transfer error exception
UTXCON Base + $010
31
0
30
0
29
0
28
0
27
0
26
0
25
0
24
0
23
0
22
0
21
0
20
0
19
0
18
0
17
0
16
0
R
W
RST
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
4
3
2
1
0
R
W
TXEMPTYCNT
TXLEVEL
0
RST
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= writes have no effect and terminate without transfer error exception
F
For More Information On This Product,
n
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