7733 datasheet(293/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–28

A-D conversion is started.

Trigger is generated.

Falling edges input to pin

ADTRG

When external trigger is selected

When internal trigger is selected

Setting of the A-D conversion start flag to “1”

A-D control register 0 (address 1E 16)

A-D conversion start flag

Note: Writing to each bit (except bit 6) of the A-D control register 0 and

each bit of the A-D control register 1 must be performed while

A-D converter stops operating, in other words, before a trigger

is generated.

When the VREF connection selection bit is cleared from “1” to “0,”

wait for an period of 1

s or more passed, and then generate

a trigger.

Setting of the A-D control registers 0, 1

A-D control register 0 (address 1E 16)

A-D control register 1 (address 1F 16)

A-D sweep pin selection bits

b1b0

0 0: AN0 and AN1 (2 pins)

0 1: AN0 to AN3 (4 pins)

1 0: AN0 to AN5 (6 pins)

1 1: AN0 to AN7 (8 pins)

Trigger selection bit

0: Internal trigger

1: External trigger

A-D conversion start flag

0: A-D conversion is stopped.

! : It may be “0” or “1.”

f2: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

A-D conversion frequency (

) selection flag

0: f2/4

1: f2/2

VREF connection selection bit

0: Pin VREF is connected.

Selection of the repeat sweep mode

Setting of the port P7 direction register

Port P7 direction register (address 11 16)

Set bits corresponding to selected

analog input pins to “0.”

When an external trigger is selected,

set bit 7 to “0.”

AN0

AN5

AN1

AN2

AN3

AN4

8-10 bit mode selection bit

0: 8-bit resolution

1: 10-bit resolution

AN7

AN6

9.8 Repeat sweep mode

Fig. 9.8.1 Initial setting example for registers related to repeat sweep mode

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