7480 datasheet(159/337 Pages) RENESAS

159 / 337 page

7480 Group and 7481 Group User's Manual

1-142

HARDWARE

1.15.2 Registers Associated with A-D Converter

Figure 1.15.2 shows the memory map of the registers associated with the A-D converter.

Figure 1.15.2 Memory Map of Registers Associated with A-D Converter

(1)

A-D Control Register

The A-D control register consists of the bits controlling the A-D converter.

Figure 1.15.3 shows the A-D control register.

Figure 1.15.3 A-D Control Register

00D916

00DA16

A-D control register (ADCON)

A-D conversion register (AD)

1.15 A-D Converter

A-D control register

b4 b3 b2 b1 b0

Name

Function

At reset

Undefined

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

0 0 0 : P20/IN0

0 0 1 : P21/IN1

0 1 0 : P22/IN2

0 1 1 : P23/IN3

1 0 0 : P24/IN4

1 0 1 : P25/IN5

1 1 0 : P26/IN6

1 1 1 : P27/IN7

b2 b1 b0

Analog input pin selection bits

(Note)

A-D conversion completion bit

VREF connection selection bit

0 : Disconnect between VREF pin and

ladder resistor

1 : Connect between VREF pin and

ladder resistor

0 : Conversion in progress

1 : Conversion completed

Not implemented.

Writing to these bits is disabled.

These bits are undefined at reading.

∗: The bit can be set to ‘0’ by software, but cannot be set to ‘1’.

Note: Do not perform setting in the 7480 Group.

Undefined

∗

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