M16C6K9 Datasheet, PDF (137/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
A-D Converter
(3) Single sweep mode
In single sweep mode, the pins selected using the A-D sweep pin selection bits are used for one-by-one A-
D conversion. Table.JA-4 shows the specifications of single sweep mode. Fig.JA-6 shows the A-D control
register in single sweep mode.
Table.JA-4 Single sweep mode specifications
Item
Specification
Function
The pins selected by the A-D sweep pin selection bits are used for one-by-one A-D conversion
Start condition
Writing “1” to A-D converter 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
AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)
Reading of result of A-D converter Read A-D registers corresponding to selected pins
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
10
Symbol
ADCON0
Address
03D616
When reset
00000XXX2
Bit symbol
Bit name
CH0
Analog input pin selection bits
Function
Invalid in single sweep mode
RW
CH1
CH2
MD0
MD1
A-D operation mode selection
bits 0
b4 b3
1 0 : Single sweep mode
TRG
Trigger selection bit
0 : Software trigger
1 : ADTRG trigger
ADST ^{A-D conversion start flag}
0 : A-D conversion disabled
1 : A-D conversion started
CKS0 Frequency selection bit 0
0 : FAD/4 selected
1 : FAD/2 selected
Note: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
A-D control register 1 (Note 1)
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 select bit
When single sweep and repeat sweep mode 0
are selected
b1 b0
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
MD2
BITS
CKS1
A-D operation mode
select bit 1
8/10-bit mode select bit
Frequency selection bit 1
Should be "0" in this mode
0 : 8-bit mode
1 : 10-bit mode
0 : FAD/2 or FAD/4 selected
1 : FAD selected
VCUT Vref connect bit
1 : Vref connected
OPA0
OPA1
ANEX0,1 selection bis
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 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Fig.JA-6 A-D conversion register in single sweep mode
Rev.1.00 Jun 06, 2003 page 137 of 290