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(lán)牙無線
文件頁數(shù): 122/156頁
文件大?。?/td> 1782K
代理商: MC72000
122
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
MOTOROLA
Hardware Functional Description
7.4.9 Interrupts
7.4.9.1 General
The SSI can generate four interrupt vectors as shown in Table 25.
7.4.9.2 Description of Interrupt Operation
The following section describes interrupt operation.
7.4.9.2.1
Receive Data with Exception
This interrupt can occur when receive interrupts are enabled via the RIE bit of the SCR2 register. When a
data word is ready to transfer from the RXSR to the SRX and the previous SRX data has not yet been read,
the ROE bit is set and the exception interrupt will occur instead of the normal receive data interrupt. An
interrupt will also occur when data is transferred from the RXSR to the RXFIFO with RFF set. In the second
case, data may or may not be lost depending on whether the FIFO has 8 words in it or has been flagged as
full by a watermark.
7.4.9.2.2
Receive Data
This interrupt can occur when receive interrupts are enabled via the RIE bit of the SCR2 register. When a
data word is ready to transfer from the RXSR to the SRX, and the ROE bit is not set, this interrupt will occur
to indicate that received data is available for processing. When the receive FIFO is enabled, this interrupt
will not occur until the receive watermark level of the FIFO is reached. If the FIFO is not enabled, this
interrupt will occur for each data word received.
7.4.9.2.3
Transmit Data with Exception
This interrupt can occur when transmit interrupts are enabled via the TIE bit of the SCR2 register. When it
is time to transfer data to the TXSR and no data is available in the STX or TXFIFO (if enabled), the TUE
status bit is set and the transmit data exception interrupt occurs.
7.4.9.2.4
Transmit Data
This interrupt can occur when transmit interrupts are enabled via the TIE bit of the SCR2 register. When
data is transferred to the TXSR, this interrupt will occur if more data is needed. If the transmit FIFO is not
enabled, this interrupt will occur for each data word transmitted. If the transmit FIFO is enabled, the
interrupt will not occur until the transmit watermark level is reached.
Table 62. Interrupt Summary
Interrupt
Source
Description
INTR+0
INTR+2
INTR+4
Receiver
Receiver
Receiver
Receive data with exception
Receive data
Receive last slot interrupt - this interrupt may not be present in all
implementations of the SSI
Transmit data with exception
Transmit data
INTR+6
INTR+8
Transmitter
Transmitter
F
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