M38203M4 Datasheet, PDF (218/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.5 Serial I/O1
Continued from Figure 2.5.20
One or more instructions (e.g., NOP) after Ž
Set the serial I/O1 receive interrupt request to “0”
b7
b0
0
IREQ1: Interrupt request register 1 [Address 3C16]
b2: Serial I/O1 receive interrupt request bit
0: No interrupt request issued
‘Enable serial I/O1 receive interrupt
b7
b0
1
ICON1: Interrupt control register 1 [Address 3E16]
b2: Serial I/O1 receive interrupt enable bit
1: Interrupts enabled
’Set transmit data to receive buffer register (RB) [Address 1816]
In full duplex data transfer mode, set transmit data.
In half duplex data transfer mode, set arbitrary dummy data.
“Processing of serial I/O1 receive interrupt
Fig. 2.5.21 Receiving method in clock synchronous mode (2)
2–132
3820 GROUP USER’S MANUAL