M30620FCAFP datasheet(439/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-122

In one-shot mode, choose functions from those listed in Table 2.7.5. Operations of the circled items are

described below. Figure 2.7.11 shows timing chart, and Figure 2.7.12 shows the set-up procedure.

2.7.5 Operation of A-D Converter (in one-shot mode, external op-amp connection mode selected)

Item

Set-up

Operation clock

φAD

Divided-by-4 fAD / divided-

by-2 fAD / fAD

8-bit / 10-bit

Software trigger

Sample & Hold

External operation amplifier

connection mode

Not activated

Activated

Expanded analog

input pin

Not used

Either ANEX0 pin or

ANEX1 pin

Resolution

Analog input pin

One of AN0 pin to AN7 pin

Trigger for starting

A-D conversion

Trigger by ADTRG

Table 2.7.5. Choosed functions

Operation (1) Setting the A-D conversion start flag to “1” causes voltage input to the ANi pin to be output

from the ANEX0 pin. The A-D conversion is carried out on voltage input to the ANEX1 pin

(connect an operation amplifier between the ANEX0 pin and the ANEX1 pin).

(2) After the A-D conversion is completed, the content of the successive comparison register

(conversion result) is transmitted to A-D register i corresponding to the ANi pin. At this time,

the A-D conversion interrupt request bit goes to “1”.

Example of wiring

Example of operation

AN0

AN1

ANEX0

ANEX1

Op-amp

Input voltage

Microcomputer

A-D register i

Result

φAD

A-D conversion

start flag

“1”

“0”

Set to “1” by software

A-D conversion

interrupt request

“1”

“0”

Cleared to “0” when interrupt request is accepted, or cleared by software

8-bit resolution : 28

φAD cycles

10-bit resolution : 33

φAD cycles

(1) Start A-D conversion

(2) A-D conversion is complete

Note: When

φAD frequency is less than 1MHZ, sample and hold function cannot be selected.

Conversion rate per analog input pin is 49

φAD cycles for 8-bit resolution and 59 φAD cycles for

10-bit resolution.

Figure 2.7.11. Operation timing of one-shot mode, with external op-amp connection mode selected

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