7733 datasheet(283/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–18

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 V REF connection selection bit is cleared from “1” to “0,”

wait for an interval of 1

s or more passed, and then generate

a trigger.

Setting of the interrupt priority level

A-D/UART2 trans./rece. interrupt control register (address 70 16)

Interrupt priority level selection bits

When using interrupts, one of levels 1 to 7 must be set.

When disabling interrupts, level 0 must be set.

Setting of the A-D control registers 0, 1

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

0 0 0: AN0 is selected.

0 0 1: AN1 is selected.

0 1 0: AN2 is selected.

0 1 1: AN3 is selected.

1 0 0: AN4 is selected.

1 0 1: AN5 is selected.

1 1 0: AN6 is selected.

1 1 1: AN7 is selected.

Trigger selection bit

0: Internal trigger

1: External trigger

A-D conversion start flag

0: A-D conversion is stopped.

Analog input selection bits

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

! : It may be “0” or “1.”

f2: Refer to chapter “14. CLOCK GENERATING

CIRCUIT.”

A-D conversion frequency (

) selection flag

0: f 2/4

1: f2/2

VREF connection selection bit

0: Pin VREF is connected.

Selection of the one-shot 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

b2b1b0

8/10-bit mode selection bit

0: 8-bit resolution

1: 10-bit resolution

AN7

AN6

9.5 One-shot mode

Fig. 9.5.1 Initial setting example for registers related to one-shot mode

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