7906 datasheet(317/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-22

12.8 Repeat mode

In the repeat mode, the A-D conversion for an input voltage from one selected analog input pin is performed

repeatedly.

In this mode, no A-D conversion interrupt request occurs. Additionally, the A-D conversion start bit (bit 6 at

address 1E16) remains set to “1” until it is cleared to “0” by software, and the A-D converter repeates its

operation while the A-D conversion start bit = “1.”

12.8.1 Settings for repeat mode

Figures 12.8.1 and 12.8.2 show initial setting examples for related registers in the repeat mode.

Fig. 12.8.1 Initial setting example for related registers in repeat 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 not selected

Continued on Figure 12.8.2.

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)

When comparator function is selected

(b15)

(b8)

A value (comparison value) in the range

from 0016 through FF16 is set.

A-D control registers 0 and 1

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)

Repeat 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.

X : It may be either “0” or “1.”

A-D conversion frequency (

φAD) select bit 0

See Table 12.2.1.

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