Datasheet

Section 17 A/D Converter
Page 1026 of 1384 R01UH0310EJ0500 Rev. 5.00
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
17.7.10 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 17.14 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
Wait for conversion
Wait for conversion
Wait for conversion
A/D conversion 1
A/D conversion 1
A/D conversion 2
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 17.14 Example of Operation Timing when A/D Conversion Starts by Conversion
Start Trigger from TPU (Units 0 and 1)