M16C6K9 Datasheet, PDF (135/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
A-D Converter
(1) One-shot mode
In one-shot mode, the pin selected using the analog input pin selection bits is used for one-shot A-D conver-
sion. Table.JA-2 shows the specifications of one-shot mode. Fig.JA-4 shows the A-D control register in one-
shot mode.
Table.JA-2 One-shot mode specifications
Item
Specification
Function
The pin selected by the analog input pin selection bits is used for one A-D conversion
Start condition
Writing “1” to A-D conversion start flag
Stop condition
• 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
Interrupt request generation timing End of A-D conversion
Input pin
One of AN0 to AN7, as selected
Reading of result of A-D converter Read A-D register corresponding to selected pin
A-D control register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
ADCON0
Address
03D616
When reset
00000XXX2
Bit symbol
Bit name
Function
CH0
CH1
CH2
Analog input pin selection
bits
b2 b1 b0
0 0 0 : AN0 is selected
0 0 1 : AN1 is selected
0 1 0 : AN2 is selected
0 1 1 : AN3 is selected
1 0 0 : AN4 is selected
1 0 1 : AN5 is selected
1 1 0 : AN6 is selected
1 1 1 : AN7 is selected
MD0
MD1
TRG
ADST
A-D operation mode
selection bits 0
Trigger selection bit
A-D conversion start flag
b4 b3
0 0 : One-shot mode
0 : Software trigger
1 : ADTRG trigger
0 : A-D conversion disabled
1 : A-D conversion started
CKS0
Frequency selection bit 0 ^{0 : FAD/4 selected}
1 : FAD/2 selected
RW
(Note 2)
(Note 2)
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.
A-D control register 1 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
1
0
Symbol
ADCON1
Address
03D716
When reset
0016
Bit symbol
Bit name
Function
RW
SCAN0
SCAN1
A-D sweep pin selection Invalid in one-shot mode
bits
MD2
BITS
CKS1
A-D operation mode
selection bit 1
0 : Any mode other than repeat sweep
mode 1
8/10-bit mode select bit 0 : 8-bit mode
1 : 10-bit mode
Frequency selection bit 1 ^{0 : FAD/2 or FAD/4 selected}
1 : FAD selected
VCUT
OPA0
OPA1
Vref connect bit
ANEX0,1 selection bis
1 : Vref connected
b7 b6
0 0 : ANEX0 and ANEX1 are not used
0 1 : ANEX0 input is A-D converted
1 0 : ANEX1 input is A-D converted
1 1 : Inhibited
Note: If the A-D control register is rewritten during A-D conversion, the conversion
result is indeterminate.
Fig.JA-4 A-D conversion register in one-shot mode
Rev.1.00 Jun 06, 2003 page 135 of 290