7480 datasheet(163/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-146

HARDWARE

1.15.4 Setting of A-D Conversion

Figure 1.15.6 shows the setting of A-D conversion.

Figure 1.15.6 Setting of A-D Conversion

1.15 A-D Converter

Analog input pin selection

000: P20/IN0

001: P21/IN1

010: P22/IN2

011: P23/IN3

100: P24/IN4

101: P25/IN5

110: P26/IN6

111: P27/IN7

(Note 1)

Notes 1: Do not set these bits in the 7480 Group.

2: Start A-D conversion after the following:

the ladder resistor is connected to VREF pin

VREF stabilization time elapses 1.0

µs or more.

Procedure 1 Disabling acceptance of A-D conversion completion interrupt

There is no A-D conversion completion interrupt request.

Interrupt request register 1 (IREQ1) [Address 00FC16]

Procedure 2 Setting A-D control register

Interrupt control register 1 (ICON1) [Address 00FE16]

A-D conversion completion interrupt acceptance disabled

A-D control register (ADCON) [Address 00D916]

VREF and ladder resistor connected

Procedure 3 Setting A-D conversion completion interrupt request bit to ‘0’

A-D conversion completion interrupt acceptance enabled

Interrupt control register 1 (ICON1) [Address 00FE16]

Procedure 4 Enabling acceptance of interrupt when A-D conversion interrupt is used

A-D conversion start

A-D control register (ADCON) [Address 00D916]

Procedure 5 Start of A-D conversion (Note 2)

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