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7721 Group User’s Manual

12–18

A-D CONVERTER

12.6 Repeat mode

Fig. 12.6.1 Initial setting example for registers relevant to repeat mode

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.

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

Trigger occur

Operation start

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).

Input falling edge to

ADTRG pin

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

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

A-D conversion start bit

0: Stop A-D conversion

Analog input select bits

A-D conversion frequency ( AD)

select bit

qA-D control register

Repeat mode

Trigger select bit

0 : Internal trigger

1 : External triggeer

0 : f2 divided by 4

1 : f2 divided by 2

b1 b0

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