mc68hc705c4acfn Freescale Semiconductor, Inc, mc68hc705c4acfn Datasheet - Page 58

• Manufacturer Part Number: mc68hc705c4acfn
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Interrupts
4.3.5 SCI Interrupts
Technical Data
58
The SCI can generate these interrupts:
Setting the I bit in the condition code register disables all SCI interrupts.
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Timer Overflow Interrupt — The timer overflow flag bit (TOF)
becomes set when the 16-bit counter rolls over from $FFFF to
$0000. TOF generates an interrupt request if the timer overflow
interrupt enable bit (TOIE) is set also.
Transmit data register empty interrupt
Transmission complete interrupt
Receive data register full interrupt
Receiver overrun interrupt
Receiver input idle interrupt
SCI Transmit Data Register Empty Interrupt — The transmit
data register empty bit (TDRE) indicates that the SCI data register
is ready to receive a byte for transmission. TDRE becomes set
when data in the SCI data register transfers to the transmit shift
register. TDRE generates an interrupt request if the transmit
interrupt enable bit (TIE) is set also.
SCI Transmission Complete Interrupt — The transmission
complete bit (TC) indicates the completion of an SCI transmission.
TC becomes set when the TDRE bit becomes set and no data,
preamble, or break character is being transmitted. TC generates
an interrupt request if the transmission complete interrupt enable
bit (TCIE) is set also.
SCI Receive Data Register Full Interrupt — The receive data
register full bit (RDRF) indicates that a byte is ready to be read in
the SCI data register. RDRF becomes set when the data in the
receive shift register transfers to the SCI data register. RDRF
generates an interrupt request if the receive interrupt enable bit
(RIE) is set also.
Interrupts
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
MOTOROLA