M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 409

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

394
A-D Converter
Operation (1) Setting the A-D conversion start flag to “1” causes voltage input to the ANi pin to be output
Figure 2.7.11. Operation timing of one-shot mode, with external op-amp connection mode selected
2.7.5 Operation of A-D Converter (in one-shot mode, external op-amp connection mode selected)
In one-shot mode, choose functions from those listed in Table 2.7.5. Operations of the circled items are
described below. Figure 2.7.11 shows timing chart, and Figure 2.7.12 shows the set-up procedure.
Example of wiring
Input voltage
Input voltage
Op-amp
Table 2.7.5. Choosed functions
(2) After the A-D conversion is completed, the content of the successive comparison register
Analog input pin
Operation clock
Resolution
Trigger for starting
A-D conversion
AD
from the ANEX0 pin. The A-D conversion is carried out on voltage input to the ANEX1 pin
(connect an operation amplifier between the ANEX0 pin and the ANEX1 pin).
(conversion result) is transmitted to A-D register i corresponding to the ANi pin. At this time,
the A-D conversion interrupt request bit goes to “1”.
Item
AN
AN
ANEX0
ANEX1
Microcomputer
1
0
O
O
O
O
Divided-by-4 f
by-2 f
Software trigger
Trigger by AD
8-bit / 10-bit
One of AN
A-D conversion
start flag
A-D register i
A-D conversion
interrupt request
Example of operation
AD
Note: When
AD
/ f
Conversion rate per analog input pin is 49
10-bit resolution.
Set-up
AD
0
pin to AN
AD
TRG
AD
/ divided-
frequency is less than 1MH
“1”
“0”
“1”
“0”
7
pin
Cleared to “0” when interrupt request is accepted, or cleared by software
(1) Start A-D conversion
Set to “1” by software
8-bit resolution : 28
10-bit resolution : 33
Sample & Hold
Expanded analog
input pin
Z
, sample and hold function cannot be selected.
AD
Item
cycles for 8-bit resolution and 59
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
AD
AD
cycles
cycles
(2) A-D conversion is complete
O
O
Not used
Either ANEX0 pin or
ANEX1 pin
External operation amplifier
connection mode
Not activated
Activated
Result
AD
Mitsubishi microcomputers
M16C / 62 Group
cycles for
Set-up