Table 14.11 Ssr Status Flags And Receive Data Handling - Hitachi H8S/2628 Hardware Manual

Table 14.11 shows the states of the SSR status flags and receive data handling when a receive
error is detected. If a receive error is detected, the RDRF flag retains its state before receiving
data. Reception cannot be resumed while a receive error flag is set to 1. Accordingly, clear the
ORER, FER, PER, and RDRF bits to 0 before resuming reception. Figure 14.9 shows a sample
flow chart for serial data reception.

Table 14.11 SSR Status Flags and Receive Data Handling

SSR Status Flag
RDRF* ORER
1 1
0 0
0 0
1 1
1 1
0 0
1 1
Note:* The RDRF flag retains the state it had before data reception.
FER PER
0 0
1 0
0 1
1 0
0 1
1 1
1 1
Receive Data
Lost
Transferred to RDR
Transferred to RDR
Lost
Lost
Transferred to RDR
Lost
Receive Error Type
Overrun error
Framing error
Parity error
Overrun error + framing error
Overrun error + parity error
Framing error + parity error
Overrun error + framing error +
parity error
Rev. 1.0, 09/02, page 323 of 568