參數資料
型號： M38279EFFS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, UVPROM, 4 MHz, MICROCONTROLLER, CQCC100
封裝： WINDOWED, CERAMIC, LCC-100
文件頁數： 28/70頁
文件大?。?/td> 1112K
代理商： M38279EFFS
34
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3827 Group
MITSUBISHI MICROCOMPUTERS
D-A CONVERTER
The 3827 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. 35 Structure of D-A control register
Fig. 36 Block diagram of D-A converter
Fig. 37 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
b7
b0
D-A control register
(DACON : address 0036 16)
D-A1 conversion register (0034 16)
D-A2 conversion register (0035 16)
P56/DA1
P57/DA2
Data bus
D-A i conversion register (8)
R-2R resistor ladder
DA i output enable bit
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
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