Renesas Hitachi H8S/2191, Hardware Manual

Page: 532 / 1065

Rev. 2.0, 11/00, page 505 of 1037
Bit 7: Transmit End Interrupt Request Flag (TEI)
Indicates that data transmission or reception has been completed.
Bit 7
TEI Description
0 [Clearing condition] (Initial value)
When 0 is written after reading 1
1 [Setting condition]
When transmission or reception has been completed
Bits 6 and 5: Reserved
When each bit is read, 1 is read at all times. Writes are disabled.
Bit 4: Extension Data Bit (SOL)
The SOL sets the output level of the SO2 pin. When read, the output level of the SO2 pin is
read. Output of the SO2 pin after completion of transmission retains the value of final bit of
transfer data, but the output level of the SO2 pin can be changed by operating this bit before or
after transmission. However, setting of the SOL bit becomes invalid when the next transmission
is started. Therefore, if the output level of the SO2 pin is changed after completion of
transmission, write operation for SOL must be performed every time when transmission is
terminated. Since writing to this register during data transfer may cause malfunction, write
operation must not be performed during transmission.
Bit 4
SOL Description
Read The SO2 pin output is at a low level (Initial value) 0
Write The SO2 pin output is changed to a low level
Read The SO2 pin output is at a high level 1
Write The SO2 pin output is changed to a high level