M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 413

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

398
A-D Converter
Operation (1) Setting the A-D conversion start flag to “1” causes the A-D converter to start the conversion
Figure 2.7.15. Operation timing of single sweep mode
2.7.7 Operation of A-D Converter (in single sweep mode)
A-D conversion
start flag
A-D register 0
A-D register 1
A-D register i
A-D conversion
interrupt request
bit
AD
In single sweep mode, choose functions from those listed in Table 2.7.7. Operations of the circled items
are described below. Figure 2.7.15 shows timing chart, and Figure 2.7.16 shows the set-up procedure.
Table 2.7.7. Choosed functions
(2) After the A-D conversion of voltage input to the AN
(3) When the A-D conversion on all the analog input pins selected is completed, the A-D conver-
Operation clock
Resolution
Analog input pin
“1”
“0”
“1”
“0”
Note: When
on voltage input to the AN
successive comparison register (conversion result) is transmitted to A-D register 0. The A-D
converter converts all analog input pins selected by the user. The conversion result is trans-
mitted to A-D register i corresponding to each pin, every time conversion on one pin is com-
pleted.
sion interrupt request bit goes to “1”. At this time, the A-D conversion start flag goes to “0”.
The A-D converter stops operating.
(1) Start A-D conversion
Item
8-bit resolution : 28
10-bit resolution : 33
Conversion rate per analog input pin is 49
Set to “1” by software
AD
AD
frequency is less than 1MH
O
O
O
AD
Divided-by-4 f
by-2 f
8-bit / 10-bit
AN
to AN
(6 pins) / AN
AD
cycles
cycles
0
and AN
AD
3
0
(4 pins) / AN
Set-up
/ f
pin.
(2)
AD
8-bit resolution : 28
10-bit resolution : 33
After A-D conversion on AN
A-D converter begins converting all pins selected
1
0
AD
(2 pins) / AN
Z
to AN
Result
, sample and hold function cannot be selected.
/ divided-
AD
0
7
to AN
(8 pins)
cycles for 8-bit resolution and 59
Cleared to “0” when interrupt request is accepted, or cleared by software
0
5
AD
Trigger for starting A-
D conversion
Sample & Hold
AD
Expanded analog
input pin
cycles
cycles
0
pin is complete,
Item
0
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
pin is completed, the content of the
Result
AD
cycles for 10-bit resolution.
O
O
O
Software trigger
Trigger by AD
Not activated
Activated
Not used
External ope-amp
connection mode
Mitsubishi microcomputers
M16C / 62 Group
Set-up
(3)
A-D conversion
is complete
Result
TRG