C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 182

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Special Function Register SCON (Address. 98 H )
Bit
TI
RI
The serial port interrupt is generated by a logical OR of flag RI and TI in SFR SCON. Neither of
these flags is cleared by hardware when the service routine is vectored to. In fact, the service
routine will normally have to determine whether it was the receive interrupt flag or the transmission
interrupt flag that generated the interrupt, and the bit will have to be cleared by software.
Semiconductor Group
Bit No.
98 H
Function
Serial interface transmitter interrupt flag
Set by hardware at the end of a serial data transmission. Must be cleared by
software.
Serial interface receiver interrupt flag
Set by hardware if a serial data byte has been received. Must be cleared by
software.
MSB
SM0
9F
H
The shaded bits are not used for interrupt control.
SM1
9E
H
SM2
9D
H
REN
9C
H
7-11
TB8
9B
H
RB8
9A
H
99
TI
H
LSB
Interrupt System
98
RI
H
Reset Value : 00 H
C505 / C505C
SCON
1997-08-01