M38002M4 Datasheet, PDF (96/173 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.3 Serial I/O
RESET
q X : This bit is not used in this application.
Set it to “0” or “1.” It’s value can be disregarded.
Initialization
SIOCON ^{(Address : 1A16)}
UARTCON ^{(Address : 1B16)}
BRG
(Address : 1C16)
P4D
(Address : 0916)
1010X0012
000010002
8 —1
XXXXXXX02
SIOSTS (Address : 1916 ), bit1?
1
Read out a reception data
from RB (Address : 1816)
0
q _{Check a completion of receiving.}
(Receive buffer full flag)
q _{Receive the first 1 byte data}
A Receive buffer full flag is set
to “0” by reading data.
SIOSTS (Address : 1916 ), bit6?
1 ^{q Check an error falag.}
0
SIOSTS (Address : 1916 ), bit1?
1
Read out a reception data
from RB (Address : 1816 )
0 _{q Check a completion of receiving.}
(Receive buffer full flag)
q _{Receive the second byte data}
A Receive buffer full flag is set
to “0” by reading data.
SIOSTS (Address : 1916 ), bit6?
0
1 ^{q Check an error flag.}
Processing for error
1
P4 (Address : 0816 ), bit0?
0
SIOCON (Address : 1A16 )
SIOCON (Address : 1A16 )
0000X0012
1010X0012
• Countermeasure for a bit slippage
Fig. 2.3.34 Control procedure at a receiving side [Communication using UART]
2-48
3800 GROUP USER’S MANUAL