3825_03 Datasheet, PDF (201/339 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.5 Serial I/O
Continued from Figure 2.5.18
One or more instructions (e.g., NOP) after Ž
Set the serial I/O transmit interrupt request to “0”
b7
b0
0
IREQ1: Interrupt request register 1 [Address 3C16]
b3: Serial I/O transmit interrupt request bit
0: No interrupts request issued
‘Enable serial I/O transmit interrupt
b7
b0
1
ICON: Interrupt control register 1 [Address 3E16]
b3: Serial I/O transmit interrupt enable bit
1: Interrupts enabled
’Set transmit data to transmit buffer register (TB) [Address 1816]
“Processing of serial I/O transmit interrupt
Fig. 2.5.19 Transmitting method in clock synchronous mode (2)
3825 GROUP USER’S MANUAL
2–129