M16CSLASH62M datasheet(437/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-120

In one-shot mode, choose functions from those listed in Table 2.7.4. Operations of the circled items

are described below. Figure 2.7.9 shows timing chart, and Figure 2.7.10 shows the set-up procedure.

2.7.4 Operation of A-D Converter (in one-shot mode, expanded analog input pin selected)

Operation (1) Setting the A-D conversion start flag to “1” causes the A-D converter to start the conversion on

voltage input to the ANEXi pin.

(2) After the A-D conversion of voltage input to the ANEXi pin is completed, the content of the

successive comparison register (conversion result) is transmitted to the A-D register. At the

same time, the A-D conversion interrupt request bit goes to “1”. Also, the A-D conversion start

flag goes to “0”, and the A-D converter stops operating.

Table 2.7.4. Choosed functions

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

Figure 2.7.9. Operation timing of one-shot mode, with expanded analog input pin selected

A-D conversion

start flag

“1”

“0”

A-D conversion

interrupt request “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 convesion is complete

“1”

A-D register i

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.

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