H8SXSLASH1663M datasheet(1125/1504 Pages) RENESAS

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Section 22 A/D Converter

Rev. 2.00 Sep. 24, 2008 Page 1093 of 1468

REJ09B0412-0200

Only execute switching from activation by an external trigger to prohibition of external

triggers or changing of the scan mode (ADSTLCR and SCANE bits) when the setting for

activation by an external trigger is in use after external trigger input has been disabled.

External trigger input can be disabled by writing specific values to bits TRGS1, TRGS0, and

EXTRGS.

For details on the procedure in cases where point 1 or 3 is applicable, see figure 22.11

ADCR.TRGS1 = 0

ADCR.TRGS0 = 0

ADCR.EXTRGS = 1

(External trigger

disabled)*2

ADCSR.ADST = 0

Change the setting by an

external trigger*2

Change the setting by an

external trigger*2

Yes

ADCR.TRGS1 = 0

ADCR.TRGS0 = 1

ADCR.EXTRGS = 1

(External trigger

disabled)*1, *2

ADCSR.ADST = 0

Yes

Unit 0

Unit 1

External trigger

halted?

External trigger

halted?

Change the scan mode

Notes: 1.

The TTGE bit in TIER of the TPU unit must be held 0.

For details, see section 14.3.4, Timer Interrupt Enable Register (TIER).

Rewrite TRGS1, TRGS0, and EXTRGS bits in ADCR simultaneously (in byte unit)

Figure 22.11 Procedure for Changing the Mode When the Setting for Activation by an

External Trigger is in Use

22.7.4

Permissible Signal Source Impedance

This LSI's analog input is designed so that the conversion accuracy is guaranteed for an input

signal for which the signal source impedance is 5 k

Ω or less. This specification is provided to

enable the A/D converter's sample-and-hold circuit input capacitance to be charged within the

sampling time; if the sensor output impedance exceeds 5 k

Ω, charging may be insufficient and it

may not be possible to guarantee the A/D conversion accuracy. However, if a large capacitance is

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