M16C6KA_15 Datasheet, PDF (121/270 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description

M16C/6KA Group
A-D Converter
(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 selected using
the A-D sweep pin selection bits. Table.JA-6 shows the specifications of repeat sweep mode 1. Fig.JA-8
shows the A-D control register in repeat sweep mode 1.
Table.JA-6 Repeat sweep mode 1 specifications
Item
Function
Start condition
Stop condition
Interrupt request generation timing
Input pin
Reading of result of A-D converter
Specification
All pins perform repeat sweep A-D conversion, with emphasis on the pin or
pins selected by the A-D sweep pin selection bits
Example : AN0 selected AN0 AN1 AN0 AN2 AN0 AN3, etc
Writing “1” to A-D conversion start flag
Writing “0” to A-D conversion start flag
Not generated
AN0 (1 pin), AN0 and AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to AN3 (4 pins)
Read A-D registers corresponding to selected pins (at any time)
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
11
Symbol
ADCON0
Address
03D616
When reset
00000XXX2
Bit symbol
Bit name
Function
CH0
Analog input pin selection bits Invalid in repeat sweep mode 1
RW
CH1
CH2
MD0
MD1
b4 b3
A-D operation mode selection _{1 1 : Repeat sweep mode 1}
bits 0
TRG
ADST
Trigger select bit
A-D conversion start flag
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
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
1
Symbol
ADCON1
Address
03D716
When reset
0016
Bit symbol
Bit name
Function
RW
SCAN0
SCAN1
A-D sweep pin selection bits
When repeat sweep mode 1 is selected
b1 b0
0 0 : AN0 (1 pin)
0 1 : AN0, AN1 (2 pins)
1 0 : AN0 to AN2 (3 pins)
1 1 : AN0 to AN3 (4 pins)
MD2
BITS
A-D operation mode selection 1 : Repeat sweep mode 1
bit 1
8/10-bit mode selection bit
0 : 8-bit mode
1 : 10-bit mode
CKS1
VCUT
Frequency selection bit 1
Vref connect bit
0 : FAD/2 or FAD/4 selected
1 : FAD selected
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-8 A-D conversion register in repeat sweep mode 1
Rev.1.00 Jul 16, 2004 page 119 of 266
REJ03B0100-0100Z