m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 354

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 13.2.3 Structure of D-A register i
Fig. 13.2.2 Structure of D-A control register
13.2.1 D-A control register
Figure 13.2.2 shows the structure of the D-A control register.
Pin DA
with no internal buffer amplifier, it is necessary to connect a buffer amplifier externally to pin DA
pin is needed to be connected with a low-impedance load.
Pin DA
enable bits is set to “1” (output enabled), the corresponding pin is used only as pin DA
multiplexed input/output pin (including a programmable I/O port pin).
13.2.2 D-A register i (i = 0, 1)
Each pin DA
shows the structure of D-A register i.
(1) D-A
Notes 1: Pin DA
Setting any of the D-A
output D-A converted analog voltage, regardless of the contents of the corresponding bits of the port
P7 and port P8 direction registers.
D-A control register (Address 96
D-A register i (i = 0, 1) (Addresses 98
Note: When not using the D-A converter, be sure to clear the contents of these bits to “00
7 to 2
7 to 0
i
i
Bit
Bit
(i = 0, 1) serves as the analog voltage output pin of the D-A converter. Since pin DA
0
1
is multiplexed with an analog input pin and I/O pins for serial I/O. When any of the D-A
i
2: When not using the D-A converter, be sure to clear this bit to “0.”
output enable bits (Bits 0, 1)
output is enabled.), however, the corresponding pin cannot function as any other multiplexed input/output pin (including a
programmable I/O port pin).
i
D-A
D-A
Nothing is assigned.
outputs the analog voltage corresponding to the value loaded in D-A register i. Figure 13.2.3
Any value in the range from 00
value will be D-A converted and will be output.
0
1
i
is multiplexed with an analog input pin and I/O pins for serial I/O. When a D-A
output enable bit
output enable bit
Bit name
i
output enable bits to “1” (output enabled) allows the corresponding pin DA
16
)
7905 Group User’s Manual Rev.1.0
0: Output is disabled.
1: Output is enabled. (Notes 1, 2)
0: Output is disabled.
1: Output is enabled. (Notes 1, 2)
16
16
Function
through FF
, 99
16
)
16
can be set (Note), and this
Function
16
.”
i
D-A CONVERTER
output enable bit = “1” (in other words,
13.2 Block description
b7 b6 b5 b4 b3 b2 b1 b0
b7
Undefined
At reset R/W
At reset R/W
i
, not as any other
0
0
0
i
is equipped
RW
RW
RW
—
i
b0
i
, if this
output
13-3
i
to