M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 168

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

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
The A-D converter consists of one 10-bit successive approximation A-D converter circuit with a capacitive coupling
amplifier. Pins P10
these pins for A-D conversion must therefore be set to input. The Vref connect bit (bit 5 at address 03D7
used to isolate the resistance ladder of the A-D converter from the reference voltage input pin (V
converter is not used. Doing so stops any current flowing into the resistance ladder from V
dissipation. When using the A-D converter, start A-D conversion only after setting bit 5 of 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
Without sample and hold function, set the
With the sample and hold function, set the
Item
AD
0
(Note 2) V
to P10
7
, P9
V
8-bit or 10-bit (selectable)
V
V
One-shot mode, repeat mode, single sweep mode, repeat sweep mode 0,
and repeat sweep mode 1
8pins (AN
• External trigger (can be retriggered)
• With sample and hold function
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
CC
CC
CC
CC
5
, and P9
TRG
= 5V
= 3V
= 5V
= 3V
IN
) exceeds 10MH
/P9
CC
0
6
to AN
7
(V
also function as the analog signal input pins. The direction registers of
f
divide-by-2 of f
• Without sample and hold function
• With sample and hold function (8-bit resolution)
• With sample and hold function (10-bit resolution)
• Without sample and hold function (8-bit resolution)
input changes from “H” to “L”
AD
CC
AN
ANEX0 and ANEX1 input (including mode in which external
operation amp is connected) : 7LSB
/divide-by-2 of f
)
3LSB
2LSB
2LSB
7
) + 2pins (ANEX0 and ANEX1)
0
to AN
AD
AD
AD
AD
Z
, and make
cycles, 10-bit resolution: 59
cycles, 10-bit resolution: 33
frequency to 250kH
frequency to 1MH
7
AD
input : 3LSB
/divide-by-4 of f
AD
Performance
/divide-by-4 of f
AD
frequency equal to 10MH
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Z
Z
AD
min.
min.
, f
AD
AD
, f
=f(X
AD
AD
AD
REF
=f(X
IN
cycles
cycles
)
, reducing the power
Mitsubishi microcomputers
16
M16C / 62 Group
REF
IN
to connect V
)
) when the A-D
Z
.
16
) can be
REF
153
.