M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 397

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

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A-D Converter
2.7 A-D Converter
Note 1: The number of conversion cycles per one analog input pin.
Note 2: The conversion time per one analog input pin (when f
Table 2.7.1. Conversion time every operation clock
Frequency selection bit 1
Frequency selection bit 0
A-D converter's operation clock
Min. conversion
cycles (Note 1)
Min. conversion
time (Note 2)
2.7.1 Overview
The A-D converter used in the M16C/62 group operates on a successive conversion basis. The following
is an overview of the A-D converter.
(1) Mode
(2) Operation clock
(3) Conversion time
The A-D converter operates in one of five modes:
(a) One-shot mode
(b) Repetition mode
(c) One-shot sweep mode
(d) Repeated sweep mode 0
(e) Repeated sweep mode 1
The operation clock in 5 V operation can be selected from the following: f
divide-by-4 f
equal to that of the CPU’s main clock.
Number of conversion for A-D convertor varies depending on resolution as given. Table 2.7.1 shows
relation between the A-D converter operation clock and conversion time.
Sample & Hold function selected:
No Sample & Hold function:
Carries out A-D conversion on input level of one specified pin only once.
Repeatedly carries out A-D conversion on input level of one specified pin.
Carries out A-D conversion on input level of two or more specified pins only once.
Repeatedly carries out A-D conversion on input level of two or more pins.
Repeatedly carries out A-D conversion on input level of two or more pins. This mode is different from
the repeated sweep mode 0 in that weights can be assigned to specifing pins control the number of
conversion times.
33 AD cycles for 10-bit resolution, or 28 AD cycles for 8-bit resolution
59 AD cycles for 10-bit resolution, or 49 AD cycles for 8-bit resolution
AD
. In 3 V operation, the selection is divide-by-2 f
8-bit mode
10-bit mode
8-bit mode
10-bit mode
AD
11.2µs
13.2µs
=
AD
0
= f(X
f
AD
4
IN
) = 10 MHz)
28 X
33 X
0
AD
AD
AD
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
or divide-by-4. The f
AD
=
5.6µs
6.6µs
1
f
AD
AD
2
, divide-by-2 f
Mitsubishi microcomputers
M16C / 62 Group
AD
frequency is
AD
Invalid
2.8µs
3.3µs
AD
= f
1
, and
AD