28-17
MB86R02 ‘Jade-D’ Hardware Manual V1.64
28.7.2 Example of transfer procedure
Set t ransmissi on data t o transmissi on FI FO
No
1.
2.
Yes
Transmissi on procedure
End
Transmissi on FI FO i s empt y
Figure 28-3 Example of transfer procedure
1. Check transmission FIFO is empty with following method:
a.
Polling process of THRE bit in the Line status register (LSR)
THRE bit shows transmission FIFO status. When the FIFO is empty, the bit becomes "1".
b.
Polling process of TEMT bit in the Line status register (LSR)
TEMT bit shows transmission FIFO and Transmission shift register statuses that data in
transmission process and empty transmission FIFO are able to be confirmed. When they
are empty, TEMT becomes "1".
c.
Transmission FIFO empty interrupt process
When all data in transmission FIFO is moved to the Transmission shift register, this interrupt
occurs. It is able to control approval/prohibition in the Interrupt enable register (URTxIER.)
Note:
During transmission FIFO empty interrupt process, check THRE bit of the LSR is
"1" before writing data to transmission FIFO.
•
THRE = 1: Transmission FIFO is empty that data is able to be written
•
THRE = 0: Transmission FIFO is not empty. Retry from interrupt process to be
FIFO empty interrupt status without writing data to transmission FIFO.
2. Set transmission data to transmission FIFO. Up to 16 byte is able to be set in the FIFO at a time.
In this case, THRE bit of the LSR becomes "0".
Note:
The last written data is deleted when writing data to transmission FIFO while it is
full.
Summary of Contents for MB86R02
Page 24: ...MB86R02 Jade D Hardware Manual V1 64 ...
Page 76: ...3 2 MB86R02 Jade D Hardware Manual V1 64 Figure 3 1 Memory map 1 ...
Page 77: ...3 3 MB86R02 Jade D Hardware Manual V1 64 Figure 3 2 Memory map 2 ...
Page 167: ...8 8 MB86R02 Jade D Hardware Manual V1 64 ...
Page 214: ...11 7 MB86R02 Jade D Hardware Manual V1 64 15 16 cycles initial value ...
Page 497: ...18 139 MB86R02 Jade D Hardware Manual V1 64 VSYNC is output 1 dot clock faster than HSYNC ...
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Page 682: ...22 2 MB86R02 Jade D Hardware Manual V1 00 FUJITSU PROPRIETARY AND CONFIDENTIAL ...
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