Datasheet

Section 23 Hardware LIN
REJ09B0465-0300 Rev. 3.00 Page 813 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
23.4 Interrupt Requests
The hardware LIN interface can request four types of interrupts: Sync Break detection, Sync
Break generation end, Sync Field measurement end, and bus conflict detection. All these
interrupts are requested as the timer RA interrupt. Table 23.2 describes these interrupt requests.
Table 23.2 Interrupt Requests by Hardware LIN
Interrupt Request Status Flag Interrupt Source
Sync Break detection
• The low-level period of the RXD input is
measured using timer RA and the counter
underflows
• The low-level period of the RXD input is
longer than the Sync Break period during
communications.
Sync Break generation end
SBDCT
The low level has been output via TXD for the
period specified by timer RA.
Sync Field measurement end SFDCT Measuring the 8-bit Sync Field period has been
completed using timer RA.
Bus conflict detection BCDCT The RXD input and TXD output values differ
from each other when data is latched while
SCI3_1 is enabled for transmission.
23.5 Usage Note
For processing the header and response field timeout, measure the time from the Sync Break
detection interrupt using another timer.