h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 346

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

11.5
11.5.1
Table 11.7 shows the interrupt sources in normal serial communication interface mode. A different
interrupt vector is assigned to each interrupt source, and individual interrupt sources can be
enabled or disabled using the enable bits in SCR.
When the TDRE flag in SSR is set to 1, a TXI interrupt request is generated. When the TEND flag
in SSR is set to 1, a TEI interrupt request is generated.
When the RDRF flag in SSR is set to 1, an RXI interrupt request is generated. When the ORER,
PER, or FER flag in SSR is set to 1, an ERI interrupt request is generated. A TEI interrupt is
generated when the TEND flag is set to 1 while the TEIE bit is set to 1. If a TEI interrupt and a
TXI interrupt are generated simultaneously, the TXI interrupt has priority for acceptance.
However, note that if the TDRE and TEND flags are cleared simultaneously by the TXI interrupt
routine, the SCI cannot branch to the TEI interrupt routine later.
Table 11.7 SCI Interrupt Sources
Rev. 2.00, 03/04, page 314 of 534
Channel
0
Interrupt Sources
Interrupts in Normal Serial Communication Interface Mode
Name
ERI0
RXI0
TXI0
TEI0
Interrupt Source
Receive Error
Receive Data Full
Transmit Data Empty
Transmission End
Interrupt Flag
ORER, FER, PER
RDRF
TDRE
TEND
Priority
High
Low