4513 datasheet(59/210 Pages) RENESAS

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HARDWARE

4513/4514 Group User’s Manual

FUNCTION BLOCK OPERATIONS

(15) Notes for the use of A-D conversion 2

Do not change the operating mode (both A-D conversion mode and

comparator mode) of A-D converter with bit 3 of register Q2 while

A-D converter is operating.

When the operating mode of A-D converter is changed from the

comparator mode to A-D conversion mode with the bit 3 of register

Q2, note the following;

• Clear bit 2 of register V2 to “0” to change the operating mode of

the A-D converter from the comparator mode to A-D conversion

mode with the bit 3 of register Q2.

• The A-D conversion completion flag (ADF) may be set when the

operating mode of the A-D converter is changed from the com-

parator mode to the A-D conversion mode. Accordingly, set a

value to register Q2, and execute the SNZAD instruction to clear

the ADF flag.

(16) Definition of A-D converter accuracy

The A-D conversion accuracy is defined below (refer to Figure 30).

• Relative accuracy

Zero transition voltage (V0T)

This means an analog input voltage when the actual A-D con-

version output data changes from “0” to “1.”

Full-scale transition voltage (VFST)

This means an analog input voltage when the actual A-D con-

version output data changes from “1023” to ”1022.”

Linearity error

This means a deviation from the line between V0T and VFST of

a converted value between V0T and VFST.

Differential non-linearity error

This means a deviation from the input potential difference re-

quired to change a converter value between V0T and VFST by 1

LSB at the relative accuracy.

• Absolute accuracy

This means a deviation from the ideal characteristics between 0

to VDD of actual A-D conversion characteristics.

Fig. 30 Definition of A-D conversion accuracy

Vn: Analog input voltage when the output data changes from “n” to “n+1” (n = 0 to 1022)

• 1LSB at relative accuracy

→

(V)

• 1LSB at absolute accuracy

→

(V)

VFST–V0T

1022

VDD

1024

VDD

V1022

Vn+1

n+1

1022

1023

Output data

Differential non-linearity error =

Linearity error =

[LSB]

b–a

[LSB]

Actual A-D conversion

characteristics

a: 1LSB by relative accuracy

b: Vn+1–Vn

c: Difference between ideal Vn

and actual Vn

Zero transition voltage (V0T)

Analog voltage

Full-scale transition voltage (VFST)

Ideal line of A-D conversion

between V0–V1022

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