M30222 Datasheet, PDF (164/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

deUvnedloepr ^ment
Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
A-D Converter
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(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 select bit. Table 1.54 shows the specifications of repeat sweep
mode 1. Figure 1.133 shows the A-D control register in repeat sweep mode 1.
Table 1.54. Repeat sweep mode 1 specifications
Item
Function
Start condition
Stop condition
Interrupt request
generation timing
Input pin
Reading A-D
converter results
Specification
All pins perform repeat sweep A-D conversion, with emphasis on the pin or pins selected
by the A-D sweep pin select bit.
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
None generated
AN₀ (1 pin), AN₀ and AN₁ (2 pins), AN₀ and AN₂ (3 pins)_, AN₀ and AN₃(4 pins)
Read A-D register corresponding to selected pin (at any time)
A-D control register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
11
Symbol
ADCON0
Address
03D616
When reset
00000XXX 2
Bit symbol
CH0
CH1
Bit name
Analog input pin
select bit
Function
Invalid in repeat sweep mode 1
RW
CH2
MD0
MD1
A-D operation mode
select bit 0
b4 b3
1 1 : Repeat sweep mode 1
TRG
Trigger select bit
0 : Software trigger
1 : AD TRG trigger
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: 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 select bit
When repeat sweep mode 1 is selected
b1 b0
0 0 : AN 0 (1 pin)
0 1 : AN 0, AN1 (2 pins)
1 0 : AN 0 to AN2 (3 pins)
1 1 : AN 0 to AN3 (4 pins)
MD2
A-D operation mode
select bit 1
1 : Repeat sweep mode 1
BITS
8/10-bit mode select bit 0 : 8-bit mode
1 : 10-bit mode
CKS1
Frequency select bit 1
0 : fAD/2 or fAD/4 is selected
1 : fADis selected
VCUT
Vref connect bit
1 : Vref connected
OPA0
OPA1
External op-amp
connection mode
bit (Note 2)
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 : External op-amp connection mode
Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result
is indeterminate.
Note 2: Neither ‘01’ nor ‘10’ can be selected with the external op-amp connection mode bit.
Fig. 1.133. A-D conversion register in repeat sweep mode 1
1-165