7721 datasheet(266/577 Pages) RENESAS

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7721 Group User’s Manual

12–15

A-D CONVERTER

12.5 One-shot mode

Fig. 12.5.1 Initial setting example for registers relevant to one-shot mode

A-D control register (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

1 0 1 : AN5 selected

1 1 0 : AN6 selected

1 1 1 : AN7 selected

b1 b0

Trigger select bit

0 : Internal trigger

1 : External trigger

A-D conversion start bit

0: Stop A-D conversion

Analog input select bits

A-D conversion frequency ( AD)

select bit

0 : f2 divided by 4

1 : f2 divided by 2

qA-D control register

One-shot mode

Note : Writing to each bit (except bit 6) of the A-D control register must be performed

while the A-D converter halts (before a trigger occurs).

qInterrupt priority level

A-D conversion interrupt control register (address 7016)

Interrupt priority level select bits

Set to a level between 1 to 7 when using this interrupt.

Set to a level 0 when disabling this interrupt.

qSet A-D conversion start bit to “1”

A-D control register (address 1E16)

A-D conversion start bit

When external trigger is selected

When internal trigger is selected

Input falling edge to

ADTRG pin

Trigger occur

Operation start

Port P7 direction register (address 1116)

qPort P7 direction register

Set the bits corresponding

to analog input pins to “0.”

Set bit 7 to “0” when

selecting external trigger.

AN1

AN2

AN3

AN5

AN6

AN7

AN4

AN0

7721 Datasheet(PDF) 266 Page - Renesas Technology Corp

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