Intel 8XC196MH, 8XC196MD, 8XC196MC manual Standard and PTS Interrupts

STANDARD AND PTS INTERRUPTS

8.Select PTS service for EPA0.

—Set PTSSEL.2.

9.Set-up EPA0 to capture on both rising and falling edges.

—Set EPA0_CON bits 4 and 5 (Figure 11-10 on page 11-19).

10.Enable the PTS and conventional interrupts.

— Use the EI instruction to enable all standard interrupts and the EPTS instruction to enable the PTS.

11.Toggle the SCK input to start the reception. Data is shifted into the most-significant (leftmost) bit first and shifts right with each successive bit received. The EPA generates an interrupt each time that the SCK input toggles. The PTS receives the next bit of data on the pin configured as RXD on even PTS cycles. When PTSCOUNT decrements to zero, the PTS calls the end-of-PTS interrupt (Figure 5-24). The interrupt service routine should disable the EPA channel, clear the DATA register, reload the PTSCOUNT and PTSCON1 registers, reload EPA0_CON, and select PTS service for EPA0. If the EPA were generating the SCK signal, the end-of-PTS interrupt service routine would also have to reload the EPA0_TIME register.

12.To determine when all bytes have been transmitted, create a loop routine to check the status of the RXDDONE flag.

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