7906 datasheet(323/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-28

12.10 Repeat sweep mode 0

In the repeat sweep mode, the A-D conversions for input voltages from multiple selected analog input pins

are performed repeatedly. The A-D conversion is performed in ascending sequence from pin AN0 to pin AN7.

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.”

12.10.1 Settings for repeat sweep mode 0

Figures 12.10.1 and 12.10.2 show initial setting examples for related registers in the repeat sweep mode 0.

Fig. 12.10.1 Initial setting example for related registers in repeat sweep mode 0 (1)

Selection of comparator function

Comparator function select register 0 (Address DC16)

0 : Comparator is not selected.

1 : Comparator is selected.

AN0

AN1

AN2

AN3

AN4

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

When comparator function is not selected

(b15)

(b8)

A value (comparison value) in the range

from 0016 through FF16 is set.

Continued on Figure 12.10.2.

A-D control registers 0 and 1

A-D control register 0

(Address 1E16)

Repeat sweep mode 0

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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