HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 454
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 14 A/D Converter
Table 14.5 Analog Input Pin Ratings
Item
Analog input capacitance
Allowable signal-source impedance
14.7.3
1. Switchover to/from general port function
2. Port C pins not used for A/D conversion
Rev. 7.00 Jan 31, 2006 page 428 of 658
REJ09B0272-0700
Note: All figures are reference values.
When the A/D converter is started by setting the A/D start bit (ADST) to 1 in the A/D
control/status register (ADCSR), or by asserting the ADTRG pin, port C pins begin
functioning as analog input pins (ANn). When A/D conversion ends, the pins are switched
back to the general port (digital input) function.
Pins not selected as AN pins by the channel select setting can be used in the following
combinations as general port pins in both single mode and scan mode.
a. When any or all of pins AN0 to AN3 are used for A/D conversion, AN4 to AN7 can be
b. When any or all of pins AN4 to AN7 are used for A/D conversion, AN0 to AN3 can be
used as general port pins.
used as general port pins.
Switchover between Analog Input and General Port Functions
Analog multiplexer
Figure 14.9 Analog Input Pin Equivalent Circuit
A/D converter
AN0–AN7
Min
—
—
1.0 k
20 pF
Max
20
3
1 M
Unit
pF
k
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