7721 datasheet(276/577 Pages) RENESAS

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7721 Group User’s Manual

12–25

A-D CONVERTER

12.8 Repeat sweep mode

Fig. 12.8.1 Initial setting example for registers relevant to repeat sweep 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 and each bit of the A-D sweep

pin select 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 : AN0, AN1 (2 pins)

0 1 : AN0–AN3 (4 pins)

1 0 : AN0–AN5 (6 pins)

1 1 : AN0–AN7 (8 pins)

b1 b0

Trigger select bit

0 : Internal trigger

1 : External trigger

A-D conversion start bit

0: Stop A-D conversion

A-D conversion frequency ( AD)

select bit

0 : f2 divided by 4

1 : f2 divided by 2

qA-D control register and A-D sweep pin select register

A-D sweep pin select register (address 1F16)

A-D sweep pin select bits

! : “0” or “1”

Repeat sweep mode

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