M16CSLASH1N datasheet(140/238 Pages) RENESAS

140 / 238 page

Rev.1.00

Oct 20, 2004

page 128 of 222

M16C/1N Group

14. A/D Converter

REJ09B0007-0100Z

External op-amp

Analog

input

AN0

AN7

AN1

AN2

AN3

AN4

AN5

AN6

ANEX1

ANEX0

Resistance ladder

Successive conversion register

Comparator

AN11

AN8

AN9

AN10

ADGSEL0=1

ADGSEL0=0

Figure 14.6 Example of external op-amp connection mode

14.3 Sample and Hold

Sample and hold is selected by setting bit 0 of the A/D control register 2 (address 00D416) to "1". When

sample and hold is selected, the rate of conversion of each pin increases. As a result, a 28 ØAD cycle is

achieved with 8-bit resolution and 33 ØAD with 10-bit resolution. Sample and hold can be selected in all

modes. However, in all modes, be sure to specify before starting A/D conversion whether sample and

hold is to be used.

14.4 Extended Analog Input Pins

In one-shot mode and repeat mode, the input via the extended analog input pins ANEX0 and ANEX1 can

also be converted from analog to digital.

When bit 6 of the A/D control register 1 (address 00D716) is "1" and bit 7 is "0", input via ANEX0 is

converted from analog to digital.

When bit 6 of the A/D control register 1 (address 00D716) is "0" and bit 7 is "1", input via ANEX1 is

converted from analog to digital.

14.5 External Operation Amp Connection Mode

In this mode, multiple external analog inputs via the extended analog input pins, ANEX0 and ANEX1, can

be amplified together by just one operation amp and used as the input for A/D conversion.

When bit 6 of the A/D control register 1 (address 00D716) is "1" and bit 7 is "1", input via AN0 to AN11 is

output from ANEX0. The input from ANEX1 is converted from analog to digital and the result stored in the

A/D register. The speed of A/D conversion depends on the response of the external operation amp. Do

not connect the ANEX0 and ANEX1 pins directly.

Figure 14.6 is an example of how to connect the pins in external operation amp mode.

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