Renesas H8SX/1658R Manual de usuario descargar pdf (Pagina 3)

RENESAS TECHNICAL UPDATE TN-H8*-A381A/E Date: Mar.26.2008

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Flowchart 1 Procedure for changing modes when starting of the A/D converter by an external trigger

signal has been selected

*2 Ensure that the TTGE bit in TIER of TPU unit 1 is set to 0 before making these settings, as is specified on page

604(H8SX1658R Group),706(H8SX1668R Group) of the hardware manual.

*3 Ensure that the TRGS1, TRGS0, and EXTRGS bits in the respective ADCR registers are set (as bytes) at the

same time.

Unit 0

External trigger

shut off?

ADCSR_ADST = 0

Change the scan mode.

Yes

ADCR_TRGS1 = 0

ADCR_TRGS0 = 0

ADCR_EXTRGS = 1

Unit 1

ADCR_TRGS1 = 0

ADCR_TRGS0 = 1

ADCR_EXTRGS = 1

Change the external trigger

setting.

External trigger

shut off?

ADCSR_ADST = 0

Change the scan mode.

Yes

ADCR_TRGS1 = 0

ADCR_TRGS0 = 0

ADCR_EXTRGS = 1

Invalidates the external trigger

ADCR_TRGS1 = 0

ADCR_TRGS0 = 1

ADCR_EXTRGS = 1

Yes

Change the external trigger

setting.

Invalidates the external trigger

2, 3

1 2 3

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Renesas H8SX/1658R Manual de usuario Pagina 3