HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 374
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HD64F3437TFI16V
Manufacturer Part Number
HD64F3437TFI16V
Description
MCU FLASH 60K 100-TQFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64F3437TFI16V.pdf
(755 pages)
Specifications of HD64F3437TFI16V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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15.2.3
ADCR is an 8-bit readable/writable register that enables or disables external triggering of A/D
conversion. ADCR is initialized to H'7F by a reset and in standby mode.
Bit 7—Trigger Enable (TRGE): Enables or disables external triggering of A/D conversion.
Bit 7: TRGE
0
1
Bits 6 to 0—Reserved: These bits cannot be modified, and are always read as 1.
15.3
ADDRA to ADDRD are 16-bit registers, but they are connected to the CPU by an 8-bit data bus.
Therefore, although the upper byte can be be accessed directly by the CPU, the lower byte is read
through an 8-bit temporary register (TEMP).
An A/D data register is read as follows. When the upper byte is read, the upper-byte value is
transferred directly to the CPU and the lower-byte value is transferred into TEMP. Next, when the
lower byte is read, the TEMP contents are transferred to the CPU.
When reading an A/D data register, always read the upper byte before the lower byte. It is possible
to read only the upper byte, but if only the lower byte is read, incorrect data may be obtained.
Figure 15.2 shows the data flow for access to an A/D data register.
342
Bit
Initial value
Read/Write
A/D Control Register (ADCR)
CPU Interface
TRGE
R/W
Description
A/D conversion cannot be externally triggered
Enables start of A/D conversion by the external trigger input (ADTRG).
(A/D conversion can be started either by an external trigger or by software.)
7
0
—
—
6
1
—
—
5
1
—
—
4
1
—
—
3
1
—
—
2
1
—
—
1
1
(Initial value)
—
—
0
1
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