One-Shot Mode - Renesas M16C Series User Manual

M30240 Group

1.2.24.1 One-shot mode

In one-shot mode, the pin selected using the analog input pin select bit is used for one-shot A-D con-
version.Table 1.31 shows the specifications of one-shot mode. Figure 1.99 shows the A-D control reg-
ister in one-shot mode.
Table 1.31: One-shot mode 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 1)
b7 b6 b5
A-D control register 1 (Note)
b7 b6 b5
0 0 1
Figure 1.99: A-D conversion register in one-shot mode
Rev.1.00 Sep 24, 2003 Page 103 of 360
The pin selected by the analog input pin select bit is used for one A-D conversion
Writing "1" to A-D conversion start flag
•End of A-D conversion (A-D conversion start flag changes to "0", except when
external trigger is selected)
•Writing "0" to A-D conversion start flag
End of A-D conversion
One of AN to AN
0
Read A-D register corresponding to selected pin
Symbol
b4 b3 b2 b1 b0
ADCON0
0 0
Bit symbol Bit name
CH0
CH1
Analog input pin select
bit
CH2
MD0
A-D operation mode
select bit 0
MD1
Trigger select bit
TRG
A-D conversion start flag
ADST
CKS0 Frequency select bit 0
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Note 2: When changing A-D operation mode, set analog input pin again.
Symbol
b4 b3 b2 b1 b0
0
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 bit1
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
, as selected
7
Address When reset
03D6 00000XXX
16 2
Function
b2 b1 b0
0 0 0 : AN is selected
0
0 0 1 : AN is selected
1
0 1 0 : AN is selected
2
0 1 1 : AN is selected
3
1 0 0 : AN is selected
4
1 0 1 : AN is selected
5
1 1 0 : AN is selected
6
1 1 1 : AN is selected
7
b4 b3
0 0 : One-shot mode
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
Invalid in one-shot mode
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
R W
(Note 2)
(Note 2)
R W