m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 159

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

A-D Converter
A-D Converter
Note 1: Does not depend on use of sample and hold function.
Note 2: Divide the f
Table 1.16.1. Performance of A-D converter
The A-D converter consists of one 10-bit successive approximation A-D converter circuit with a capacitive coupling
amplifier. Pins P10
for A-D conversion must therefore be set to input. The Vref connect bit (bit 5 at address 03D7
resistance ladder of the A-D converter from the reference voltage input pin (V
Doing so stops any current flowing into the resistance ladder from V
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 1.16.1 shows the performance of the A-D converter. Figure 1.16.1 shows the
block diagram of the A-D converter, and Figures 1.16.2 and 1.16.3 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 f
Resolution
Integral nonlinearity error When AV
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 f
With the sample and hold function, set the f
Item
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
AD
0
to P10
AD
(Note 2) f
if f(X
7
also function as the analog signal input pins AN
IN
) exceeds 10MH
8-bit or 10-bit (selectable)
• With 8-bit resolution: ±2LSB
• With 10-bit resolution: ±3LSB
When AV
• With 8-bit resolution: ±2LSB
• With 10-bit resolution: ±5LSB
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
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 f
8-bit resolution: 28 f
, f
TRG
AD
/2, f
/P1
CC
CC
CC
0
Renesas Technology Corp.
AD
to AN
5
(V
= V
= V
input (shared with INT3) changes from “H” to “L”
/3, f
CC
REF
REF
Z
)
7
, and make f
AD
)
/4, f
= 5V
= 3.3V
AD
AD
AD
AD
AD
cycles, 10-bit resolution: 59 f
cycles, 10-bit resolution: 33 f
frequency to 250kH
frequency to 1MH
/6, or f
AD
16
REF
Performance
AD
frequency equal to or less than 10MHz.
to connect V
, reducing the power dissipation. When using the
/12 where f
0
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
to AN
REF
Z
) when the A-D converter is not used.
7
REF
Z
. The direction registers of these pins
min.
min.
AD
.
=f(X
16
AD
AD
IN
) can be used to isolate the
)
cycles
cycles
M16C/26 Group
153