H8SSLASH2240 datasheet(551/818 Pages) RENESAS

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Section 14 A/D Converter

Rev.3.00 Mar. 26, 2007 Page 509 of 772

REJ09B0355-0300

Bit 5—A/D Start (ADST): Selects starting or stopping on A/D conversion. Holds a value of 1

during A/D conversion.

The ADST bit can be set to 1 by software, a timer conversion start trigger, or the A/D external

trigger input pin (

ADTRG).

Bit 5

ADST

Description

• A/D conversion stopped

(Initial value)

• Single mode: A/D conversion is started. Cleared to 0 automatically when

conversion on the specified channel ends

• Scan mode: A/D conversion is started. Conversion continues sequentially on the

selected channels until ADST is cleared to 0 by software, a reset, or

a transition to standby mode or module stop mode.

Bit 4—Scan Mode (SCAN): Selects single mode or scan mode as the A/D conversion operating

mode. See section 14.4, Operation, for single mode and scan mode operation. Only set the SCAN

bit while conversion is stopped (ADST = 0).

Bit 4

SCAN

Description

Single mode

(Initial value)

Scan mode

Bit 3—Clock Select (CKS): Sets the A/D conversion time. Only change the conversion time

while conversion is stopped (ADST = 0).

Set the conversion time to a value equal to or greater than the conversion time indicated in section

19.5, A/D Conversion Characteristics.

Bit 3

CKS

Description

Conversion time = 266 states (max.)

(Initial value)

Conversion time = 134 states (max.)

Bit 2—Reserved: This bit can be read or written, but should only be written with 0.

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