Repeat-Sweep Mode 1 - Renesas M16C Series User Manual

M30240 Group

1.2.24.5 Repeat-sweep mode 1

In repeat-sweep mode 1, all pins are used for A-D conversion with emphasis on the pin or pins select-
ed using the A-D sweep pin select bit. Table 1.35 shows the specifications of repeat-sweep mode 1.
Figure 1.103 show the A-D control in repeat-sweep mode 1.
Table 1.35: Repeat-sweep mode 1 specification
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
1 1
A-D control register 1 (Note)
b7 b6 b5 b4
1
0 0
Figure 1.103: A-D conversion register in repeat-sweep mode 1
Rev.1.00 Sep 24, 2003 Page 107 of 360
All pins perform repeat sweep A-D conversion, with emphasis on the pin or
pins selected by the A-D sweep pin select bit
Example: AN
Writing "1" to A-D conversion start flag
Writing "0" to A-D conversion start flag
None generated
AN (1 pin), AN
0
Read A-D register corresponding to selected pin (at any time)
b3 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.
b3 b2 b1 b0
Symbol
1
ADCON1
Bit symbol Bit name
SCAN0
A-D sweep pin select bit
SCAN1
A-D operation mode
MD2
select bit 1
BITS
8/10-bit mode select bit
CKS1
Frequency select bit 1
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
selected AN AN AN
0 0 -> 1 ->
and AN (2 pins), AN
0 1
Address When reset
03D6 00000XXX
16 2
Function
Invalid in repeat sweep mode 1
b4 b3
1 1 : Repeat sweep mode 1
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 repeat sweep mode 1 is selected
b1 b0
0 0 : AN (1 pin)
0
0 1 : AN , AN (2 pins)
0 1
1 0 : AN to AN (3 pins)
0 2
1 1 : AN to AN (4 pins)
0 3
1 : 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
AN AN AN , etc.
0 -> 2 -> 0 -> 3
to AN (3 pins), AN to AN
0 2 0
R W
R W
(4 pins)
3