M30622ECTFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30622ECTFP Datasheet - Page 146

• Manufacturer Part Number: M30622ECTFP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

A-D Converter
A-D Converter
Table 1.20.1. Performance of A-D converter
Note 1: Does not depend on use of sample and hold function.
Note 2: Divide the frequency if f(X
Note 3: The pins are not used as the analog input pins can be used as normal I/O ports, or I/O pins of
The A-D converter consists of one 10-bit successive approximation A-D converter circuit with a capacitive coupling
amplifier. Pins P10
direction registers of these pins for A-D conversion must therefore be set to input. The Vref connect bit (bit 5 at
address 03D7
pin (V
V
03D7
The result of A-D conversion is stored in the A-D registers of the selected pins. When set to 10-bit precision, the low
8 bits are stored in the even addresses and the high 2 bits in the odd addresses. When set to 8-bit precision, the low
8 bits are stored in the even addresses.
Table 1.20.1 shows the performance of the A-D converter. Figure 1.20.1 shows the block diagram of the
A-D converter, and Figures 1.20.2 and 1.20.3 show the A-D converter-related registers.
Method of A-D conversion Successive approximation (capacitive coupling amplifier)
Analog input voltage (Note 1) 0V to AV
Operating clock
Resolution
Absolute precision
Operating modes
Analog input pins
A-D conversion start condition • Software trigger
Conversion speed per pin • Without sample and hold function
REF
, reducing the power dissipation. When using the A-D converter, start A-D conversion only after setting bit 5 of
16
REF
Tentative Specifications REV.A
each peripheral function.
Without sample and hold function, set the
With the sample and hold function, set the
to connect V
S
) when the A-D converter is not used. Doing so stops any current flowing into the resistance ladder from
Item
pecifications in this manual are tentative and subject to change.
16
) can be used to isolate the resistance ladder of the A-D converter from the reference voltage input
AD
0
to P10
(Note 2) f
REF
.
7
, P9
8-bit or 10-bit (selectable)
One-shot mode, repeat mode, single sweep mode, repeat sweep mode 0,
and repeat sweep mode 1
8 pins (AN
AN
• External trigger (can be retriggered)
• With sample and hold function
AD
A-D conversion starts when the A-D conversion start flag changes to “1”
A-D conversion starts when the A-D conversion start flag is “1” and the
___________
AD
8-bit resolution: 49
8-bit resolution: 28
5
8-bit resolution
10-bit resolution
, P9
/divide-by-2 of f
20
TRG
IN
to AN
6
, P0
) exceeds 10MH
/P9
CC
0
0
27
7
(V
to P0
to AN
When the extended analog input pins ANEX0, ANEX1, AN
and AN
input changes from “H” to “L”
)
2LSB
3LSB
CC
7
)
, and P2
7
AD
) + 2 pins (ANEX0 and ANEX1) + 16 pins (AN
20
(Note 3)
/divide-by-4 of f
to AN
AD
AD
146
AD
AD
Z
cycles, 10-bit resolution: 59
cycles, 10-bit resolution: 33
, and make
0
27
frequency to 250kH
frequency to 1MH
7LSB
to P2
are used as the external operation amp connection mode:
7
Performance
also function as the analog signal input pins. The
AD
AD
, f
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
frequency equal to 10MH
AD
=f(X
Z
Z
min.
min.
IN
) (V
CC
AD
AD
Mitsubishi microcomputers
= 5V)
cycles
cycles
M16C / 62T Group
00
to AN
00
Z
.
to AN
07,
07
,