M16C26 Datasheet, PDF (165/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev.
Specifications in this manual are
A-D Converter
0.9
tentative
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
(3) Single sweep mode
In single sweep mode, the pins selected using the A-D sweep pin select bits, are used for one-by-one A-
D conversion. Table 1.16.5 shows the specifications of single sweep mode. Figure 1.16.6 shows the
settings of the A-D control registers in single sweep mode.
Table 1.16.5. Single sweep mode specifications
Item
Function
Start condition
Stop condition
Interrupt request
generation timing
Input pin
Reading of A-D result
Specification
The pin selected by the analog input pin select bits is used for one A-D conversion
Writing "1" to the 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 the A-D conversion start flag
End of A-D conversion
AN0 - AN1 (2 pins), AN0 - AN3 (4 pins), AN0 - AN5 (6 pins), or AN0 - AN7 (8 pins)
Read A-D register that corresponds to selected analog input pin
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
10
Symbol
ADCON0
Address When reset
03D616 00000XXX2
Bit symbol
Bit name
Function
RW
CH0
Analog input pin select Invalid in single sweep mode
bit
CH1
CH2
MD0
MD1
TRG
ADST
CKS0
A-D operation mode
select bit 0
b4 b3
1 0 : Single sweep mode
Trigger select bit
0 : Software trigger
1 : ADTRG trigger
A-D conversion start flag 0 : A-D conversion disabled
1 : A-D conversion started
Frequency select bit 0 Refer to table 1.16.2
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
SCAN0
A-D sweep pin
select bit
SCAN1
Function
When single sweep mode is 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)
RW
MD2
BITS
CKS1
A-D operation mode
select bit 1
Set to 0 when this mode is selected
8/10-bit mode select bit 0 : 8-bit mode
1 : 10-bit mode
Frequency select bit1 Refer to table 1.16.2
VCUT Vref connect bit (Note 2) 1 : Vref connected
Nothing is assigned.
In an attempt to write to these bits, write 0. The value, if read, turns out to be 0.
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result is indeterminate.
Note 2: If the VCUT bit is reset from "0" (Vref unconnected) to "1" (Vref connected), wait for 1 µs or more before starting
A-D conversion.
Figure 1.16.6. A-D conversion control registers in single sweep mode
Renesas Technology Corp.
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