M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 405

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

390
A-D Converter
Figure 2.7.7. Operation timing of one-shot mode, with an external trigger selected
Operation
2.7.3 Operation of A-D Converter (in one-shot mode, an external trigger selected)
In one-shot mode, choose functions from those listed in Table 2.7.3. Operations of the circled items are
described below. Figure 2.7.7 shows timing chart, and Figure 2.7.8 shows the set-up procedure.
A-D
conversion
start flag
A-D conversion
interrupt request
AD
A-D register i
AD
TRG
Table 2.7.3. Choosed functions
(1) If the level of the AD
(2) After A-D conversion is completed, the content of the successive comparison register (con-
(3) If the level of the AD
Note: When
Operation clock
Analog input pin
Resolution
Trigger for starting
A-D conversion
AD
the A-D converter begins operating.
version result) is transmitted to A-D register i. At this time, the A-D conversion interrupt re-
quest bit goes to “1”. Also the A-D converter stops operating.
from step (1) again. If the level of the AD
in progress, the A-D converter stops the A-D conversion in process, and carries out conver-
sion from step (1) again.
Conversion rate per analog input pin is 49
Item
“H”
“1”
“0”
“L”
“1”
“0”
AD
frequency is less than 1MH
O
O
O
O Trigger by AD
Cleared to “0” when interrupt request is accepted, or cleared by software
___________
___________
(1) Start A-D conversion
Divided-by-4 f
by-2 f
Software trigger
8-bit / 10-bit
One of AN
Set to “1” by software
TRG
TRG
8-bit resolution : 28
10-bit resolution : 33
AD
pin changes from “H” to “L”, the A-D converter carries out conversion
changes from “H” to “L” with the A-D conversion start flag set to “1”,
/ f
Set-up
AD
0
pin to AN
AD
TRG
Z
, sample and hold function cannot be selected.
/ divided-
AD
7
cycles for 8-bit resolution and 59
pin
___________
AD
AD
cycles
TRG
cycles
pin changes from “H” to “L” while conversion is
Sample & Hold
Expanded analog
input pin
(2) A-D conversion is
complete
Item
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Result
AD
cycles for 10-bit resolution.
O
O
Either ANEX0 pin or
ANEX1 pin
Not used
External operation amplifier
connection mode
Not activated
Activated
(3) Start A-D
Mitsubishi microcomputers
M16C / 62 Group
conversion
Set-up