UART TX: Difference between revisions

Latest revision as of 22:05, 1 July 2022

Number	PortNumber::$133B
Decimal	NumberDec::4923
Short desc.	ShortDesc::Sends byte to serial port. If read, tells if data in RX buffer
Bit Mask	[[PortMask::%0001 0011 0011 1011]]
Readable	Readable::Yes
Writable	Writable::Yes
Subsystem	Subsystem::UART

0x133B UART Tx

(R)

bit 7 = 1 if the Rx is in a break condition ; external device has held Tx=0 for at least 20 bit periods

bit 6 = 1 if the Rx experienced a framing error ; (clears on read, includes parity and stop bit errors)

bit 5 = 1 if the next Rx byte was received after an error condition was detected (framing, overflow)

bit 4 = 1 if the Tx buffer is empty

bit 3 = 1 if the Rx buffer is near full (3/4)

bit 2 = 1 if the Rx buffer overflowed ; (clears on read)

bit 1 = 1 if the Tx buffer is full

bit 0 = 1 if the Rx buffer contains bytes

(W)

Send a byte to the connected device.

@@ Line 8: / Line 8: @@
 |Subsystem=UART
 }}
-Write:
+x133B UART Tx
-: send a byte to the connected device.  There is no Tx buffer so the program must make sure the last transmission is completed before sending another byte.
-Read:
+(R)
-: bit 2 = 1 if the read buffer is full
+:bit 7 = 1 if the Rx is in a break condition      ; external device has held Tx=0 for at least 20 bit periods
-: bit 1 = 1 if the transmitter is busy sending a byte
+:bit 6 = 1 if the Rx experienced a framing error  ; (clears on read, includes parity and stop bit errors)
-: bit 0 = 1 if the read buffer contains received bytes
+:bit 5 = 1 if the next Rx byte was received after an error condition was detected (framing, overflow)
+:bit 4 = 1 if the Tx buffer is empty
+:bit 3 = 1 if the Rx buffer is near full (3/4)
+:bit 2 = 1 if the Rx buffer overflowed            ; (clears on read)
+:bit 1 = 1 if the Tx buffer is full
+:bit 0 = 1 if the Rx buffer contains bytes
+(W)
+:Send a byte to the connected device.