Rev. 3.0, 10/02, page 538 of 686
16.3.3
A/D Control Register (ADCR)
The ADCR enables A/D conversion started by an external trigger signal.
Bit
Bit Name Initial Value
R/W
Description
7
6
TRGS1
TRGS0
0
0
R/W
R/W
Timer Trigger Select 0 and 1
Enables the start of A/D conversion by a trigger signal.
Only set bits TRGS0 and TRGS1 while conversion is
stopped (ADST = 0).
00: A/D conversion start by software
01: A/D conversion start by TPU
10: A/D conversion start by TMR
11: A/D conversion start by external trigger pin
(
ADTRG
)
5
4
—
—
1
1
—
—
Reserved
These bits are always read as 1 cannot be modified.
3
2
CKS1
CKS0
0
0
R/W
R/W
Clock Select 0 and 1
These bits specify the A/D conversion time. The
conversion time should be changed only when ADST =
0. Specify a setting that gives a value within the range
shown in table 24.7.
00: Conversion time = 530 states (max.)
01: Conversion time = 266 states (max.)
10: Conversion time = 134 states (max.)
11: Conversion time = 68 states (max.)
The conversion time setting should exceed the
conversion time shown in section 24.6, A/D Converter
Characteristics.
1
0
—
—
1
1
—
—
Reserved
These bits are always read as 1 cannot be modified.
Содержание H8S/2215 Series
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Страница 481: ...Rev 3 0 10 02 page 423 of 686 I O pin Control OUT IN TDI pin TDO pin Figure 14 2 Boundary Scan Register Configuration ...
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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