Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 13 UART
FEUL620Q504 13–3
13.2.2 UART0 Receive Buffer (UA0BUF)
Address: 0F710H
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
UA0BUF U0B7 U0B6 U0B5 U0B4 U0B3 U0B2 U0B1 U0B0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
UA0BUF is a special function register (SFR) used to store the received data.
Since data received at termination of reception is stored in UA0BUF, read the contents of UA0BUF using the
UART0 interrupt at termination of reception. At continuous reception, UA0BUF is updated whenever reception
terminates. Any write to UA0BUF is disabled.
When the 5- to 7-bit data length is selected, unnecessary bits become "0".
13.2.3 UART0 Transmit Buffer (UA1BUF)
Address: 0F718H
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
UA1BUF U1B7 U1B6 U1B5 U1B4 U1B3 U1B2 U1B1 U1B0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
UA1BUF is a special function register (SFR) used to store the transmitted data.
Write data to be transmitted in the UA1BUF. To transmit data consecutively, confirm the U1FUL flag of the
transmit status register (UA1STAT) becomes "0", then write the next transmitted data to UA1BUF. Any value
written to UA1BUF can be read. When the 5- to 7-bit data length is selected, unnecessary bits become invalid in
the transmit mode.