Renesas 4514 - Manual (Page 153)

APPLICATION
2.5 A-D converter
2-50 4513/4514 Group User’s Manual
2.5.1 Related registers
(1) A-D control register Q1
Analog input pin selection bits are assigned to register Q1.
Set the contents of this register through register A with the TQ1A instruction. The TAQ1 instruction
can be used to transfer the contents of register Q1 to register A.
Table 2.5.1 shows the A-D control register Q1.
Table 2.5.1 A-D control register Q1
A-D control register Q1 at reset : 0000 2 at power down : state retained R/W
Not used
Analog input pin selection bits
(Note 2)
Q1 3
Q1 2
Q1 1
Q1 0
0
1
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: Select A IN4 –A IN7 with register Q1 after setting register Q2.
(2) A-D control register Q2
Analog input pin selection bits and A-D operation mode control bit are assigned to register Q2.
Set the contents of this register through register A with the TQ2A instruction. The TAQ2 instruction
can be used to transfer the contents of register Q2 to register A.
Table 2.5.2 shows the A-D control register Q2.
Table 2.5.2 A-D control register Q2
Q1 2
0
0
0
0
1
1
1
1
Q1 1
0
0
1
1
0
0
1
1
This bit has no function, but read/write is enabled.
Selected pin
A IN0
A IN1
A IN2
A IN3
A IN4 (Not available for 4513 Group)
A IN5 (Not available for 4513 Group)
A IN6 (Not available for 4513 Group)
A IN7 (Not available for 4513 Group)
Q1 0
0
1
0
1
0
1
0
1
A-D control register Q2 at reset : 0000 2 at power down : state retained R/W
A-D operation mode control bit
P4 3 /A IN7 , P4 2 /A IN6 pin function
selection bit (Note 3)
P4 1 /A IN5 pin function selection bit
(Note 3)
P4 0 /A IN4 pin function selection bit
(Note 3)
Q2 3
Q2 2
Q2 1
Q2 0
0
1
0
1
0
1
0
1
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: Select A IN4 –A IN7 with register Q1 after setting register Q2.
3: In the 4513 Group, these bits are not used.
4: In the 4513 Group, only read/write of these bits is enabled.
A-D conversion mode
Comparator mode
P4 3 , P4 2 (I/O) (Note 4)
A IN7 , A IN6 /P4 3 , P4 2 (Output) (Note 4)
P4 1 (I/O) (Note 4)
A IN5 /P4 1 (Output) (Note 4)
P4 0 (I/O) (Note 4)
A IN4 /P4 0 (Output) (Note 4)