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M37220M3-XXXSP/FP

4.5 Functional description

4-17

7220 Group User’s Manual

D-A conversion is performed by setting the value in

the DA conversion register. The result of D-A

conversion is output from the DA pin by setting “1”

to the DA output enable bit of the port P3 output

mode control register (bits 2 and 3 at address 00CD16).

The output analog voltage V is determined with the

value n (n: decimal number) in the DA conversion

V=VCC !

(n= 0 to 63)

The DA output does not build in a buffer, so connect

an external buffer when driving a low-impedance

load.

Table 4.5.4 Relationship between contents of D-A conversion

bit 5

bit 4

bit 3

bit 1

A-D control register

bit 0

bit 2

Output

voltage “V”

0/64 VCC

1/64 VCC

2/64 VCC

61/64 VCC

62/64 VCC

63/64 VCC

4.5.5 D-A converter

M37220M3-XXXSP/FP has 2 D-A converter with 6-bit resolution. Figure 4.5.7 shows the D-A converter

block diagram.

Fig. 4.5.7 D-A converter block diagram

Data bus

DA1 output enable bit

Resistor ladder

DA1 conversion register

P30/A-D5/DA1

(address 00DE16)

P31/A-D6/DA2

Resistor ladder

DA2 conversion register

(address 00DF16)

DA2 output enable bit

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