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D2
TRBS: Transmit Busy Flag
Indicates the transmit shift register status.
1 (R):
Operating
0 (R):
Standby (default)
TRBS is set to 1 when transmission data is loaded from the transmit data buffer into the shift register
and is reset to 0 when the data transfer is complete. Inspect TRBS to determine whether the transmit
circuit is operating or at standby.
D1
RDRY: Receive Data Ready Flag
Indicates that the receive data buffer contains valid received data.
1 (R):
Data can be read
0 (R):
Buffer empty (default)
RDRY is set to 1 when received data is loaded into the receive data buffer and is reset to 0 when all data
has been read from the receive data buffer.
D0
TDBE: Transmit Data Buffer Empty Flag
Indicates the state of the transmit data buffer.
1 (R):
Buffer empty (default)
0 (R):
Data exists
TDBE is reset to 0 when transmit data is written to the transmit data buffer and is set to 1 when the data
is transferred to the shift register.
S1C17001 TECHNICAL MANUAL
EPSON
18 UART
225
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