M16C80 Datasheet, PDF (179/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
21. A/D Converter
A/D control register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
ADCON0
Address When reset
039616 00000XXX2
Bit symbol
Bit name
Function
CH0
CH1
CH2
Analog input pin select bit
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
A/D operation mode select
bit 0
b4 b3
0 0 : One-shot mode
0 1 : Repeat mode
1 0 : Single sweep mode
1 1 : Repeat sweep mode 0
Repeat sweep mode 1
TRG
Trigger select bit
0 : Software trigger
1 : ADTRG trigger
RW
(Note 2)
(Note 2)
ADST
A/D conversion start flag 0 : A/D conversion disabled
1 : A/D conversion started
CKS0 ^{Frequency select bit 0}
0 : fAD/4 is selected
1 : fAD/2 is selected
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 1)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
ADCON1
Address
039716
When reset
0016
Bit symbol
Bit name
SCAN0
A/D sweep pin
select bit
SCAN1
Function
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)
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)
RW
MD2
BITS
CKS1
A/D operation mode 0 : Any mode other than repeat sweep mode 1
select bit 1
1 : Repeat sweep mode 1
8/10-bit mode select 0 : 8-bit mode
bit
1 : 10-bit mode
Frequency select bit 0 : fAD/2 or fAD/4 is selected
1 (Note 2)
1 : fAD is selected
VCUT ^{Vref connect bit}
0 : Vref not connected
1 : Vref connected
OPA0
OPA1
External op-amp
connection mode bit
b7 b6
0 0 : ANEX0 and ANEX1 are not used(Note 3)
0 1 : ANEX0 input is A/D converted(Note 4)
1 0 : ANEX1 input is A/D converted(Note 5)
1 1 : External op-amp connection mode(Note 6)
Note 1: If the A/D control register is rewritten during A/D conversion, the conversion result is indeterminate.
Note 2: When f(XIN) is over 10 MHz, the fAD frequency must be under 10 MHz by dividing.
Note 3: Set "0" to PSL3_5 and PSL3_6 of the function select register B3.
Note 4: Set "1" to PSL3_5 of the function select register B3.
Note 5: Set "1" to PSL3_6 of the function select register B3.
Note 6: Set "1" to PSL3_5 and PSL3_6 of the function select register B3.
Figure 21.2 A/D converter-related registers (1)
Rev.1.00 Aug. 02, 2005 ^{Page 168} of 329
REJ09B0187-0100