Renesas PROM Programming Adapter PCA7408 Bedienungsanleitung Seite 51

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M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
Rev.1.00 Oct 01, 2002 page 51 of 110
REJ03B0134-0100Z
Fig. 8.9.1 D-A converter block diagram
8.9 D-A CONVERTER
This microcomputer has 2 D-A converters with 6-bit resolution. D-A
converter block diagram is shown in Figure 8.9.1.
D-A conversion is performed by setting the value in the DA conver-
sion 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: deci-
mal number) in the DA conversion register.
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.
n
64
6
Data bus
DA1 conversion
register
DA2 conversion
register
[address 00DE
16
]
6
[address 00DF
16
]
Resistor ladder
DA1 output enable bit
Resistor ladder
DA2 output enable bit
P3
0
/A-D5/DA1
P3
1
/A-D6/DA2
Note: Only M37221EASP/FP have a built-in D-A converter.
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