Repeat-Sweep Mode 0 - Renesas M16C Series User Manual

M30240 Group

1.2.24.4 Repeat-sweep mode 0

In repeat-sweep mode 0, the pins selected using the A-D sweep pin select bit are used for repeat
sweep A-D conversion. Table 1.34 shows the specifications of repeat-sweep mode 0. Figure 1.102
shows the A-D control register in repeat-sweep mode 0.
Table 1.34: Repeat-sweep mode 0 specifications
Item
Function
Start condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
A-D control register 0 (Note)
b7 b6 b5 b4 b3
1 1
A-D control register 1 (Note)
b7 b6 b5 b4 b3
0 0 1
0
Figure 1.102: A-D conversion register in repeat-sweep mode 0
Rev.1.00 Sep 24, 2003 Page 106 of 360
The pins selected by the A-D sweep pin select bit are used for repeat sweep A-D
conversion
Writing "1" to A-D conversion start flag
Writing "0" to A-D conversion start flag
None generated
AN and AN
0 1
pins)
Read A-D register corresponding to selected pin (at any time)
b2 b1 b0
Symbol
ADCON0
Bit symbol Bit name
CH0
Analog input pin
CH1
select bit
CH2
A-D operation mode
MD0
select bit 0
MD1
Trigger select bit
TRG
A-D conversion start flag
ADST
Frequency select bit 0
CKS0
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
b2 b1 b0
Symbol
ADCON1
Bit symbol Bit name
SCAN0
A-D sweep pin select bit
SCAN1
A-D operation mode
MD2
select bit 1
8/10-bit mode select bit
BITS
Frequency select bit 1
CKS1
VCUT Vref connect bit
Reserved bit
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Specification
(2 pins), AN to AN (4 pins), AN
0 3
Address When reset
03D6 00000XXX
16 2
Function
Invalid in repeat sweep mode 0
b4 b3
1 1 : Repeat sweep mode 0
0 : Software trigger
1 : AD trigger
TRG
0 : A-D conversion disabled
1 : A-D conversion started
0 : f /4 is selected
AD
1 : f /2 is selected
AD
Address When reset
03D7 00
16 16
Function
When single sweep and repeat sweep mode 0
are selected
b1 b0
0 0 : AN , AN (2 pins)
0 1
0 1 : AN to AN (4 pins)
0 3
1 0 : AN to AN (6 pins)
0 5
1 1 : AN to AN (8 pins)
0 7
0 : Any mode other than repeat sweep mode 1
0 : 8-bit mode
1 : 10-bit mode
0 : f /2 or f /4 is selected
AD AD
1 : f is selected
AD
1 : Vref connected
Always set to "0"
A-D Converter
to AN (6 pins), or AN to AN
0 5 0
R W
R W
(8
7