Datasheet

Section 18 A/D Converter

R01UH0309EJ0500 Rev. 5.00 Page 1093 of 1408

Sep 24, 2012

H8S/2456, H8S/2456R, H8S/2454 Group

18.7.10 Notes on Start of A/D Conversion by Conversion Start Trigger from TPU (Units 0

and 1)

When A/D conversion starts by a conversion start trigger from the TPU, the register settings of the

TPU and A/D converters must be checked so that A/D conversion does not start at unintended

timing.

When the TTGE bit in multiple channels of the TPU (units 0 and 1) is set to 1 and the TRGS1,

TRGS0, and EXTRGS bits in ADCR_0 and ADCR_1 are set to b’010 at the start of A/D

conversion by a conversion start trigger from the TPU, the A/D converter units 0 and 1 start A/D

conversion by the trigger accepted first regardless of the number of the TPU unit which has issued

the trigger. The trigger requested during A/D conversion is ignored. Figure 18.14 shows an

example of the operation timing when A/D conversion starts by the trigger from the TPU (units 0

and 1).

Wait for conversion

A/D conversion 1

A/D conversion 2

A conversion start trigger during A/D conversion

is ignored.

Conversion start trigger from

TPU (unit 0: channels 0 to 5)

Conversion start trigger from

TPU (unit 1: channels 6 to 11)

A/D converter

unit 0

A/D converter

unit 1

ADST in

operation

ADST in

operation

Figure 18.14 Example of Operation Timing when A/D Conversion Starts by Conversion

Start Trigger from TPU (Units 0 and 1)