7906 datasheet(320/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-25

12.9 Single sweep mode

In the single sweep mode, the operation for the input voltages from multiple selected analog input pins are

performed, one at a time. The operation is performed in ascending sequence from pin AN0 to pin AN7. An

A-D conversion interrupt request occurs when the operations for all selected analog input pins are completed.

12.9.1 Settings for single sweep mode

Figures 12.9.1 and 12.9.2 show initial setting examples for related registers in the single sweep 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. 12.9.1 Initial setting example for related registers in single sweep 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

When comparator function is 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 12.9.2.

A-D control registers 0 and 1

A-D control register 0

(Address 1E16)

Single sweep mode

A-D conversion start bit

0 : A-D conversion halts.

A-D conversion frequency (

φAD) select bit 0

See Table 12.2.1.

A-D sweep pin select bits

b1 b0

0 0 : AN0, AN1 (2 pins)

0 1 : AN0 to AN3 (4 pins)

1 0 : AN0 to AN4 (5 pins)

A-D control register 1

(Address 1F16)

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.”

000

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