LM3S9B81 Datasheet, PDF (376/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

External Peripheral Interface (EPI)
Figure 10-16. FRAME Signal Operation, FRM50=0 and FRMCNT=2
Clock
(EPI0S31)
WR
(EPI0S28)
RD
(EPI0S29)
Frame
(EPI0S30)
When FRM50 is set, the FRAME signal transitions on the rising edge of either the WR or RD strobes.
When FRMCNT=0, the FRAME signal transitions on the rising edge of WR or RD for every access,
see Figure 10-17 on page 376.
Figure 10-17. FRAME Signal Operation, FRM50=1 and FRMCNT=0
Clock
(EPI0S31)
WR
(EPI0S28)
RD
(EPI0S29)
Frame
(EPI0S30)
When FRMCNT=1, the FRAME signal transitions on the rising edge of the WR or RD strobes for
every other access, see Figure 10-18 on page 376.
Figure 10-18. FRAME Signal Operation, FRM50=1 and FRMCNT=1
Clock
(EPI0S31)
WR
(EPI0S28)
RD
(EPI0S29)
Frame
(EPI0S30)
When FRMCNT=2, the FRAME signal transitions the rising edge of the WR or RD strobes for every
third access, and so on for every value of FRMCNT, see Figure 10-19 on page 376.
Figure 10-19. FRAME Signal Operation, FRM50=1 and FRMCNT=2
CLOCK
(EPI0S31)
WR
(EPI0S28)
RD
(EPI0S29)
FRAME
(EPI0S30)
376
June 29, 2010
Texas Instruments-Advance Information