7906 datasheet(330/531 Pages) RENESAS

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D-A CONVERTER

7906 Group User’s Manual Rev.2.0

13-3

13.2 Block description

13.2.1 D-A control register

Figure 13.2.2 shows the structure of the D-A control register.

Pin DAi (i = 0, 1) serves as the analog voltage output pin of the D-A converter. Since pin DAi is equipped

with no internal buffer amplifier, it is necessary to connect a buffer amplifier externally to pin DAi, if this

pin is needed to be connected with a low-impedance load.

Pin DAi is multiplexed with an analog input pin, external interrupt input pin, and trigger input pin in the pulse

output port mode. When any of the D-Ai output enable bits is set to “1” (output enabled), the corresponding

pin is used only as pin DAi, not as any other multiplexed input/output pin (including a programmable I/O

port pin).

Fig. 13.2.2 Structure of D-A control register

(1) D-Ai output enable bits (Bits 0, 1)

Setting any of the D-Ai output enable bits to “1” (output enabled) allows the corresponding pin DAi to

output D-A converted analog voltage, regardless of the contents of the corresponding bits of the port

P7 direction register.

13.2.2 D-A register i (i = 0, 1)

Each pin DAi outputs the analog voltage corresponding to the value loaded in D-A register i. Figure 13.2.3

shows the structure of D-A register i.

7 to 2

Bit name

Bit

Function

At reset

R/W

D-A0 output enable bit

D-A1 output enable bit

Nothing is assigned.

b7 b6 b5 b4 b3 b2 b1 b0

0: Output is disabled.

1: Output is enabled. (Notes 1, 2)

0: Output is disabled.

1: Output is enabled. (Notes 1, 2)

—

D-A control register (Address 9616)

Notes 1: Pin DAi is multiplexed with an analog input pin, external interrupt input pin, and trigger input pin in the pulse output port mode.

When a D-Ai output enable bit = “1” (in other words, output is enabled.), however, the corresponding pin cannot function as

any other multiplexed input/output pin (including a programmable I/O port pin).

2: When not using the D-A converter, be sure to clear this bit to “0.”

7 to 0

Bit

D-A register i (i = 0, 1) (Addresses 9816, 9916)

Function

At reset

R/W

Any value in the range from 0016 through FF16 can be set (Note), and this

value will be D-A converted and will be output.

Fig. 13.2.3 Structure of D-A register i

Undefined

Note: When not using the D-A converter, be sure to clear the contents of these bits to “0016.”

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