7906 datasheet(314/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-19

12.7 One-shot mode

In the one-shot mode, the operation for an input voltage from one selected analog input pin is performed

once, and an A-D conversion interrupt request occurs at completion of the operation.

12.7.1 Settings for one-shot mode

Figures 12.7.1 and 12.7.2 show initial setting examples for related registers in the one-shot mode.

When using an interrupt, it is necessary to set the related registers to enable an interrupt. Refer to

“CHAPTER 6. INTERRUPTS” for more details.

Fig. 12.7.1 Initial setting example for related registers in one-shot mode (1)

Selection of comparator function

Comparator function select register 0 (Address DC16)

0 : Comparator function is not selected

1 : Comparator function is selected.

AN0

AN1

AN2

AN3

AN4

When comparator function is selected

When comparator function is not selected

A-D register i

A-D register 0 (Addresses 2116, 2016 )

A-D register 1 (Addresses 2316, 2216)

A-D register 2 (Addresses 2516, 2416)

A-D register 3 (Addresses 2716, 2616)

A-D register 4 (Addresses 2916, 2816)

(b15)

(b8)

A value (comparison value) in the range

from 0016 through FF16 is set.

Continued on Figure 12.7.2.

A-D control register 0

(Address 1E16)

0 0 0 : AN0 selected

0 0 1 : AN1 selected

0 1 0 : AN2 selected

0 1 1 : AN3 selected

1 0 0 : AN4 selected

b2 b1 b0

A-D conversion start bit

0 : A-D conversion halts.

Analog input pin select bits

A-D control register 1

(Address 1F16)

X : It may be either “0” or “1.”

A-D conversion frequency (

φAD) select bit 0

See Table 12.2.1.

One-shot mode

Resolution select bit

0 : 8-bit resolution mode

1 : 10-bit resolution mode

A-D conversion frequency (

φAD) select bit 1

See Table 12.2.1.

VREF connection select bit

0 : Pin VREF is connected.

A-D control registers 0 and 1

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