360
Bit 7: TDRE
Description
0
TDR contains valid transmit data
TDRE is cleared to 0 when:
•
Software reads TDRE after it has been set to 1, then writes 0 in TDRE
•
The DMAC writes data in TDR
1
TDR does not contain valid transmit data
(Initial value)
TDRE is set to 1 when:
•
The chip is reset or enters standby mode
•
The TE bit in the serial control register (SCR) is cleared to 0
•
TDR contents are loaded into TSR, so new data can be written in TDR
•
Bit 6 (Receive Data Register Full (RDRF)): RDRF indicates that RDR contains received data.
Bit 6: RDRF
Description
0
RDR does not contain valid received data
(Initial value)
RDRF is cleared to 0 when:
•
The chip is reset or enters standby mode
•
Software reads RDRF after it has been set to 1, then writes 0 in RDRF
•
The DMAC reads data from RDR
1
RDR contains valid received data.
RDRF is set to 1 when serial data is received normally and transferred from
RSR to RDR.
Note:
RDR and RDRF are not affected by detection of receive errors or by clearing of the RE bit
to 0 in the serial control register. They retain their previous contents. If RDRF is still set to 1
when reception of the next data ends, an overrun error (ORER) occurs and the received
data is lost.
•
Bit 5 (Overrun Error (ORER)): Indicates that data reception ended abnormally due to an
overrun error.
Summary of Contents for HD6417032
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Page 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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