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VR4102 Datasheet(PDF) 452 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 452 Page - NEC

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CHAPTER 22 DSIU (DEBUG SERIAL INTERFACE UNIT)
452
Receive error flag
Receive operations can be affected by three types of error flags that are set during the receive operations: a
parity error flag, a framing error flag, and an overrun error flag.
A receive error interrupt request is issued after these three types of error flags are ORed.
During a receive error interrupt (Dsiu_Intser0), the contents of the ASIS0REG can be read to detect which
kind of error occurred during reception.
The contents of the ASIS0REG are reset (to “0”) when the receive buffer (RXB0REG or RXB0LREG) is read
or when the next data is received (another error flag is set if the next data also contains an error).
Table 22-2. Receive Error Causes
Receive error
Cause
Parity error
Parity specified during reception does not match parity of receive data
Framing error
Stop bit is not detected
Overrun error
Reception of the next data is completed before data is read from the receive buffer
Figure 22-4. Receive Error Timing
Dsiu_Intsr0
D0
Parity
D7
D6
D5
D4
D3
D2
D1
Start
Stop
DDIN
Dsiu_Intser0



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