M16CSLASH62M datasheet(428/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-111

(4) Functions selection

(a) Sample & Hold function

Sample & Hold function samples input voltage when A-D conversion starts and carries out A-D

conversion on the voltage sampled. When A-D conversion starts, input voltage is sampled for 3

cycles of the operation clock. When the Sample & Hold function is selected, set the operation clock

for A-D conversion to 1 MHz or higher.

(b) 8-bit A-D to 10-bit A-D switching function

Either 8-bit resolution or 10-bit resolution can be selected. When 8-bit resolution is selected, the 8

higher-order bits of the 10-bit A-D are subjected to A-D conversion. The equations for 10-bit resolu-

tion and 8-bit resolution are given below:

10-bit resolution

(Vref X n / 210 ) – (Vref X 0.5 / 210 )

(n = 1 to 1023), 0 (n = 0)

8-bit resolution

(Vref X n / 28 ) – (Vref X 0.5 / 210 )

(n = 1 to 255), 0 (n = 0)

The user can select software or an external pin input to start A-D conversion.

(d) External operation amplifier connection function

The selected A-D convertor pin input voltage can be output from the ANEX0 pin. By connecting an

operation amplifier between the ANEX1 pin and ANEX0 pin when using this function, the input volt-

age to all A-D conversion pins can be amplified with one operation amplifier.

(e) Expanded analog input pins function

A-D conversion can be done for voltage input from either the ANEX0 pin or the ANEX1 pin.

(f) Connecting or cutting Vref

Cutting Vref allows decrease of the current flowing into the A-D converter. To decrease the

microcomputer's power consumption, cut Vref. To carry out A-D conversion, start A-D conversion 1

µs or longer after connecting Vref.

The following are exsamples in which functions (a) through (f) are selected:

• One-shot mode ...................................................................................................................... P2-116

___________

• One-shot mode, trigger by ADTRG ............................................................................................................... P2-118

• One-shot mode, software trigger, expanded analog input ..................................................... P2-120

• One-shot mode, software trigger, external operation amplifier connected ............................ P2-122

• Repeat mode, software trigger .............................................................................................. P2-124

• One-shot sweep mode, software trigger ................................................................................ P2-126

• Repeated sweep mode 0, software trigger ............................................................................ P2-128

• Repeated sweep mode 1, software trigger ............................................................................ P2-130

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