Rev. 1.0, 09/02, page 433 of 568
17.3.3
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
Enable the start of A/D conversion by a trigger
signal. Bits TRGS0 and TRGS1 should be set while
A/D conversion is stopped (ADST = 0).
00: A/D conversion is started by software
01: A/D conversion is started by TPU conversion
start trigger
10: Setting prohibited
11: A/D conversion is started by the
ADTRG
pin
5, 4
All
1
Reserved
These bits are always read as 1.
3
2
CKS1
CKS0
0
0
R/W
R/W
Clock Select 0 and 1
Specify the A/D conversion time. The conversion
time should be changed only when ADST = 0.
Specify a value within the range shown in table
23.7 in section 23, Electrical Characteristics.
00: Conversion time = 530 states (max.)
01: Conversion time = 266 states (max.)
10: Conversion time = 134 states (max.)
11: Conversion time = 68 states (max.)
1, 0
All
1
Reserved
These bits are always read as 1.
Summary of Contents for H8S/2627
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