Renesas H8SX/1658R Manual de usuario descargar pdf (Pagina 2)

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Date: Mar.26.2008

RENESAS TECHNICAL UPDATE

Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan

Renesas Technology Corp.

Product

Category

Technical Notification

Lot No.

Applicable

Product

H8SX/1658R, H8SX/1654R, H8SX/1653R,

H8SX/1668R, H8SX/1664R, H8SX/1663R

All lots

Reference

Document

H8SX/1658R Group Hardware Manual

(REJ09B0413-0100)

H8SX/1668R Group Hardware Manual

(REJ09B0412-0100)

We would like to inform you of a point regarding usage of the A/D converter of the H8SX/1658R and 1668R Group

products. Please take this information into consideration when using the products.

When starting of the A/D converter by an external trigger is in use, stopping of the A/D converter may not be

possible when any of the following ((1) to (3)) is executed.

*1 External trigger: Conversion-start trigger from the ADTRG input pin or peripheral modules (TMR and TPU)

(1) Changing the value of the ADST bit in the ADCSR register from 0 to 1

(2) Changing from the activation by external trigger setting to the external-trigger-disabled setting

(3) Changing the scan-mode setting (changing the setting of the SCANE and ADSTCLR bits to switch

from continuous scan mode to single mode or one-cycle scan mode)

If any of the above situations is relevant, please make settings in accord with the instructions below.

If case (1) is applicable:

Do not set 1 to the ADST bit in ADCSR register.

If case (2) or (3) is applicable:

Be sure to invalidate the external trigger input before changing the setting from activation by the external trigger to

disabling of the external trigger or changing the scan-mode setting (changing the setting of the SCANE and

ADSTCLR bits) while activation by the external trigger is in use.

Setting the TRGS1, TRGS0, and EXTRGS bits in the ADCR register to the values given overleaf invalidates the

external trigger input for the start of A/D conversion.

See flowchart 1 for details of the procedure in the event of (2) or (3).

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