7513 datasheet(38/66 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

7513 Group

D-A CONVERTER

The 7513 group has an on-chip D-A converter with 8-bit resolution

and 2 channels (DAi (i=1, 2)). The D-A converter is performed by

setting the value in the D-A conversion register. The result of D-A

converter is output from DAi pin. When using the D-A converter,

the corresponding port direction register bit (P56/DA1, P57/DA2)

should be set to “0” (input status).

The output analog voltage V is determined by the value n (base

10) in the D-A conversion register as follows:

V=VREF ✕ n/256 (n=0 to 255)

Where VREF is the reference voltage.

At reset, the D-A conversion registers are cleared to “0016”, the

DAi output enable bits are cleared to “0”, and DAi pin goes to

high impedance state. The DA output is not buffered, so connect

an external buffer when driving a low-impedance load.

Fig. 37 Structure of D-A control register

Fig. 38 Block diagram of D-A converter

Fig. 39 A-D converter, D-A converter block diagram

DA1 output enable bit/DA 1 VREF

ON/OFF switch

DA2 output enable bit/DA 2 VREF

ON/OFF switch

Not used (return “0” when read)

0 : Output disabled/OFF

1 : Output enabled/ON

D-A control register

(DACON : address 0036 16)

VREF

Resistor ladder

A-D conversion register

(10 bits)

D-A1 conversion register (8 bits)

D-A2 conversion register (8 bits)

R-2R resistor ladder

D-A2 output

D-A1 output

(P56)

(P57)

D-A2 output enable switch

D-A1 output enable switch

VREF input

ON/OFF switch

Internal: D-A output

External: VREF

Reference voltage input select switch

D-A1 VREF ON/OFF switch

D-A2 VREF ON/OFF switch

D-A1 conversion register

(DA1: address 003416)

D-A2 conversion register

(DA2: address 003516)

P56/DA1

P57/DA2

Data bus

D-A i conversion register (8)

R-2R resistor ladder

DA i output enable bit

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