M30622ECTFP datasheet(155/184 Pages) MITSUBISHI

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155

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

A-D Converter

(a) Sample and hold

Sample and hold is selected by setting bit 0 of the A-D control register 2 (address 03D416) to “1”. When

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

φAD cycle is

achieved with 8-bit resolution and 33

φAD 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.

(b) 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 03D716) is “1” and bit 7 is “0”, input via ANEX0 is

converted from analog to digital. The result of conversion is stored in A-D register 0.

When bit 6 of the A-D control register 1 (address 03D716) is “0” and bit 7 is “1”, input via ANEX1 is

converted from analog to digital. The result of conversion is stored in A-D register 1.

Furthermore, the input via 16pins of the extended analog input pins AN00 to AN07, AN20 to AN27 can be

converted from analog to digital. These pins can be used the same as AN0 to AN7.

Use the A-D control register 2 (address 03D416) bit 1 and bit 2 to select the pin group AN0 to AN7, AN00

to AN07, AN20 to AN27.

In the selected pin group, the pins is not used as the analog input pin, can be used as normal I/O ports, or

I/O pins of each peripheral function.

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 03D716) is “1” and bit 7 is “1”, input via AN0 to AN7(Note

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

in the corresponding 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 1.20.9 is an example of how

to connect the pins in external operation amp mode.

Note 1: AN00 to AN07, AN20 to AN27 can be used the same as AN0 to AN7.

(d) Caution of using A-D converter

(1) Set the direction register of the following ports to input: the port corresponding to a pin to be used as

an analog input pin and external trigger input pin(P97).

(2) In using a key-input interrupt, none of 4 pins (AN4 through AN7) can be used as an A-D conversion port

(if the A-D input voltage goes to ‘‘L’’ level, a key-input interrupt occurs).

(3) Insert the capacitor between AVcc and AVss, between VREF and AVss, and between the analog input

pin (ANi) and AVss, to prevent a malfunction or program runaway, and to reduce conversion error,

due to noise. Figure 1.20.10 is an example connection of each pin.

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