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HD6432633 Datasheet, PDF (921/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)
19.2.3 A/D Control Register (ADCR)
Bit
:
7
6
5
4
3
2
1
0
TRGS1 TRGS0 —
—
CKS1 CKS0
—
—
Initial value :
0
0
1
1
0
0
1
1
R/W
: R/W
R/W
—
—
R/W R/W
—
—
ADCR is an 8-bit readable/writable register that enables or disables external triggering of A/D
conversion operations and sets the A/D conversion time.
ADCR is initialized to H'33 by a reset, and in standby mode or module stop mode.
Bits 7 and 6—Timer Trigger Select 1 and 0 (TRGS1, TRGS0): Select enabling or disabling of
the start of A/D conversion by a trigger signal. Only set bits TRGS1 and TRGS0 while conversion
is stopped (ADST = 0).
Bit 7
Bit 6
TRGS1 TRGS0 Description
0
0
A/D conversion start by software is enabled
(Initial value)
1
A/D conversion start by TPU conversion start trigger is enabled
1
0
A/D conversion start by 8-bit timer* conversion start trigger is enabled
1
A/D conversion start by external trigger pin (ADTRG) is enabled
Note: * This function is not available in the H8S/2695.
Bits 5, 4, 1, and 0—Reserved: They are always read as 1 and cannot be modified.
Bits 3 and 2—Clock Select 1 and 0 (CKS1, CKS0): These bits select the A/D conversion time.
The conversion time should be changed only when ADST = 0.
Set bits CKS1 and CKS0 to give a conversion time of at least 10 µs when AVCC ≥ 4.5 V, and at
least 16 µs when AVCC < 4.5 V.
Bit 3
CKS1
0
1
Bit 2
CKS0
0
1
0
1
Description
Conversion time = 530 states (max.)
Conversion time = 266 states (max.)
Conversion time = 134 states (max.)
Conversion time = 68 states (max.)
(Initial value)
867