7721 datasheet(272/577 Pages) RENESAS

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7721 Group User’s Manual

12–21

A-D CONVERTER

12.7 Single sweep mode

Fig. 12.7.1 Initial setting example for registers relevant to single 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

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.

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”

Single sweep mode

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