M30620FCAFP datasheet(433/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-116

In one-shot mode, choose functions from those listed in Table 2.7.2. Operations of the circled items are

described below. Figure 2.7.5 shows the operation timing, and Figure 2.7.6 shows the set-up procedure.

2.7.2 Operation of A-D converter (one-shot mode)

Figure 2.7.5. Operation timing of one-shot mode

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

Operation

A-D conversion

start flag

“1”

“0”

A-D conversion

interrupt request

A-D register i

“1”

“0”

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

Result

φAD

8-bit resolution : 28

φAD cycles

10-bit resolution : 33

φAD cycles

Set to “1” by software

(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.

Table 2.7.2. Choosed functions

(1) Setting the A-D conversion start flag to “1” causes the A-D converter to begin operating.

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

version result) is transmitted to A-D register i. At this time, the A-D conversion interrupt re-

quest bit goes to “1”. Also, the A-D conversion start flag goes to “0”, and the A-D converter

stops operating.

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