M30620FCAFP datasheet(157/274 Pages) MITSUBISHI

157 / 274 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

A-D Converter

157

(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.

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 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 op-

eration amp. Do not connect the ANEX0 and ANEX1 pins directly. Figure 1.17.9 is an example of how to

connect the pins in external operation amp mode.

Analog

input

External op-amp

AN0

AN7

AN1

AN2

AN3

AN4

AN5

AN6

ANEX1

ANEX0

Resistor ladder

Successive conversion register

Comparator

Figure 1.17.9. Example of external op-amp connection mode

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