Repeat Mode - Renesas M16C Series User Manual

M30240 Group

1.2.24.2 Repeat mode

In repeat mode, the pin selected using the analog input pin select bit is used for repeated A-D conver-
sion.Table 1.32 shows the specifications of repeat mode. Figure 1.100 shows the A-D control register
in repeat mode.
Table 1.32: Repeat mode specification
Item
Function
Star condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
A-D control register 0 (Note 1) A-D control register 0 (Note 1)
b7 b7 b6 b6 b5 b5 b4 b4
0 1 0 1
A-D control register 1 (Note) A-D control register 1 (Note)
b7 b7 b6 b6 b5 b5 b4 b4
0 0 0 0 1 1
Figure 1.100: A-D conversion register in repeat mode
Rev.1.00 Sep 24, 2003 Page 104 of 360
The pin selected by the analog input pin select bit is used for repeated A-D
Writing "1" to A-D conversion start flag
Writing "0" to A-D conversion start flag
None generated
One of AN0 to AN7, as selected
Read A-D register corresponding to selected pin
b3 b3 b2 b2 b1 b1 b0 b0
Symbol Symbol Address Address
ADCON0 ADCON0 03D6 03D6
Bit symbol Bit symbol Bit name Bit name
CH0 CH0
Analog input pin Analog input pin
CH1 CH1
select bit select bit
CH2 CH2
MD0 MD0
A-D operation mode A-D operation mode
select bit 0 select bit 0
MD1 MD1
TRG TRG
Trigger select bit Trigger select bit
A-D conversion start flag A-D conversion start flag
ADST ADST
CKS0 CKS0 Frequency select bit 0 Frequency select bit 0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion Note 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate. result is indeterminate.
Note 2: When changing A-D operation mode, set analog input pin again. Note 2: When changing A-D operation mode, set analog input pin again.
b3 b3 b2 b2 b1 b1 b0 b0
Symbol Symbol Address Address
0 0
ADCON1 ADCON1 03D7 03D7
Bit symbol Bit symbol Bit name Bit name
SCAN0 SCAN0
A-D sweep pin A-D sweep pin
select bit select bit
SCAN1 SCAN1
A-D operation mode A-D operation mode
MD2 MD2
select bit 1 select bit 1
8/10-bit mode select bit 8/10-bit mode select bit
BITS BITS
CKS1 CKS1 Frequency select bit 1 Frequency select bit 1
VCUT VCUT
Vref connect bit Vref connect bit
Reserved bit Reserved bit
Note: If the A-D control register is rewritten during A-D conversion, the conversion Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate. result is indeterminate.
Specification
When reset When reset
00000XXX 00000XXX
16 16 2 2
Function Function
b2 b1 b0 b2 b1 b0
0 0 0 : AN 0 0 0 : AN is selected is selected
0 0
0 0 1 : AN 0 0 1 : AN is selected is selected
1 1
0 1 0 : AN 0 1 0 : AN is selected is selected
2 2
0 1 1 : AN 0 1 1 : AN is selected is selected
3 3
1 0 0 : AN 1 0 0 : AN is selected is selected
4 4
1 0 1 : AN 1 0 1 : AN is selected is selected
5 5
1 1 0 : AN 1 1 0 : AN is selected is selected
6 6
1 1 1 : AN 1 1 1 : AN is selected is selected
7 7
b4 b3 b4 b3
0 1 : Repeat mode 0 1 : Repeat mode
0 : Software trigger 0 : Software trigger
1 : AD 1 : AD trigger trigger
TRG TRG
0 : A-D conversion disabled 0 : A-D conversion disabled
1 : A-D conversion started 1 : A-D conversion started
0 : f 0 : f /4 is selected /4 is selected
AD AD
1 : f 1 : f /2 is selected /2 is selected
AD AD
When reset When reset
00 00
16 16 16 16
Function Function
Invalid in repeat mode Invalid in repeat mode
0 : Any mode other than repeat sweep mode 1 0 : Any mode other than repeat sweep mode 1
0 : 8-bit mode 0 : 8-bit mode
1 : 10-bit mode 1 : 10-bit mode
0 : f 0 : f /2 or f /2 or f /4 is selected /4 is selected
AD AD AD AD
1 : f 1 : f is selected is selected
AD AD
1 : Vref connected 1 : Vref connected
Always set to "0" Always set to "0"
A-D Converter
R R W W
(Note 2) (Note 2)
(Note 2) (Note 2)
R R W W