M306V5EESP Mitsubishi, M306V5EESP Datasheet - Page 138

• Manufacturer Part Number: M306V5EESP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

138
2.12 A-D Converter
Table 2.12.1 Performance of A-D converter
Notes 1: Does not depend on use of sample and hold function.
The A-D converter consists of one 8-bit successive approximation A-D converter circuit with a capacitive
coupling amplifier. Pins P3
registers of these pins for A-D conversion must therefore be set to input. The Vref connect bit (bit 5 at
address 03D7
voltage (V
ladder from V
after setting bit 5 of 03D7
The result of A-D conversion is stored in the A-D registers of the selected pins.
Table 2.12.1 shows the performance of the A-D converter. Figure 2.12.1 shows the block diagram of the A-
D converter, and Figures 2.12.2 to 2.12.5 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 AD (Note 2) f
Resolution
Absolute precision
Operating modes
Analog input pins
A-D conversion start condition • Software trigger
Conversion speed per pin • Without sample and hold function
2: Divide the frequency if f(X
sample and hold function, set the
With the sample and hold function, set the
Item
REF
REF
) when the A-D converter is not used. Doing so stops any current flowing into the resistance
16
) can be used to isolate the resistance ladder of the A-D converter from the reference
, reducing the power dissipation. When using the A-D converter, start A-D conversion only
16
8-bit
V
One-shot mode, repeat mode, single sweep mode, repeat sweep mode 0,
and repeat sweep mode 1
6 pins (AN
• With sample and hold function
6
AD
, P3
to connect V
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
A-D conversion starts when the A-D conversion start flag changes to “1”
49
28
CC
/divide-by-2 of f
= 5V
7
AD
AD
IN
, P4
) exceeds 10 MHz, and make
cycles
cycles
CC
0
0
–P4
(V
to AN
• Without sample and hold function: 5 LSB
• With sample and hold function: 5 LSB
REF
CC
3
AD
)
.
also function as the analog signal input pins. The direction
5
AD
)
frequency to 250kHz min.
/divide-by-4 of f
AD
frequency to 1MHz min.
Performance
AD
AD
, f
and ON-SCREEN DISPLAY CONTROLLER
AD
frequency equal to 10 MHz. Without
=f(X
MITSUBISHI MICROCOMPUTERS
IN
M306V5ME-XXXSP
)
M306V5EESP
Rev. 1.0