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SH7052 bảng dữ liệu(PDF) 522 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7052 bảng dữ liệu(HTML) 522 Page - Renesas Technology Corp

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496
14.5
Usage Notes
Sections 14.5.1 through 14.5.9 provide information concerning use of the SCI.
14.5.1
TDR Write and TDRE Flag
The TDRE bit in the serial status register (SSR) is a status flag indicating loading of transmit data
from TDR into TSR. The SCI sets TDRE to 1 when it transfers data from TDR to TSR. Data can
be written to TDR regardless of the TDRE bit status. If new data is written in TDR when TDRE is
0, however, the old data stored in TDR will be lost because the data has not yet been transferred to
TSR. Before writing transmit data to TDR, be sure to check that TDRE is set to 1.
14.5.2
Simultaneous Multiple Receive Errors
Table 14.13 indicates the state of the SSR status flags when multiple receive errors occur
simultaneously. When an overrun error occurs, the RSR contents cannot be transferred to RDR, so
receive data is lost.
Table 14.13 SSR Status Flags and Transfer of Receive Data
SSR Status Flags
Receive Data
Transfer
Receive Error Status
RDRF
ORER
FER
PER
RSR
→
→
→
→ RDR
Overrun error
1
1
0
0
X
Framing error
0
0
1
0
O
Parity error
0
0
0
1
O
Overrun error + framing error
1
1
1
0
X
Overrun error + parity error
1
1
0
1
X
Framing error + parity error
0
0
1
1
O
Overrun error + framing error + parity
error
11
1
1
X
Note:
O: Receive data is transferred from RSR to RDR.
X: Receive data is not transferred from RSR to RDR.



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