m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 222

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.9 A/D Converter
Table 2.9.1. Conversion time every operation clock
Note 1: The number of conversion cycles per one analog input pin.
Note 2: The conversion time per one analog input pin (when f
2.9.1 Overview
Frequency select bit 1
Frequency select bit 0
A/D converter's
operation clock
Min. conversion
cycles (Note 1)
Min. conversion
time (Note 2)
The A/D converter used in the M30245 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 can be selected from the following: f
divide-by-4 f
tion clock to 10 MHz or lower. When f(X
by dividing.
Number of conversion for A/D convertor varies depending on resolution as given. Table 2.9.1 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 specified pins.
Repeatedly carries out A/D conversion on input level of two or more specified 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
page 213 of 354
. The f
AD
frequency is equal to that of the CPU’s main clock (f
10-bit mode
10-bit mode
8-bit mode
8-bit mode
IN
) is over 10 MHz, the f
AD
= f(X
AD
8.4 s
9.9 s
IN
= f
1
0
) = 10 MHz)
AD
/3
AD
AD
, divide-by-2 f
11.2 s
13.2 s
= f
AD
0
0
AD
frequency must be under 10 MHz
28
33
/4
AD
AD
AD
AD
AD
5.6 s
6.6 s
= f
=f(X
, divide-by-3 f
0
1
AD
IN
/2
)). Set the opera-
2. A/D Converter
AD
2.8 s
3.3 s
AD
1
1
= f
, and
AD