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參數(shù)資料
型號(hào): W921E880
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位的微控制器)
中文描述: 4-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 24/62頁
文件大小: 511K
代理商: W921E880
W921E880
- 24 -
When the DACTL REG. bit0 is set by software, the 8-bits D/A converter starts converting. The only
way to disable the D/A converter is to reset bit0 of the DACTL REG by software control. The analog
signal will go to pin P5.3 in this chip if the I/O port is set up as a D/A output pin.
The power source of the D/A converter (R-2R circuit) can be selected from either V
DD
or 2.25V by
programming the DACTL REG bit2.
D/A CONVERTER LSB DATA REG.
DALSB REG: (ADDRESS = 017H)
(Default data = 0H)
b3
b2
b1
b0
D/A CONVERTER MSB DATA REG.
DAMSB REG: (ADDRESS = 018H)
(Default data = 0H)
b3
b2
b1
b0
6.10 Comparator Control Reg.
There is a 4-channel input to the negative terminal of the comparator (can alo be programmed to the
positive terminal), but only one channel will be active at any given time. The control register is shown
below.
ANIMUX REG: (ADDRESS = 019H)
(Default data = 0H)
b3
b2
b1
b0
b0
0
1
0
1
b1
0
0
1
1
ANI0
ANI1
ANI2
ANI3
Enable
Reserved
Reserved
COMPTR REG: (ADDRESS = 01AH)
(Default data = 04H)
b3
b2
b1
b0
0: Cpos VOLTAGE < Cneg VOLTAGE
1: Cpos VOLTAGE >= Cneg VOLTAGE
0: COMP stop
1; COMP start
(Read Only)
1: Iref = P5.3/DAOUT
0: Iref = P5.2/Vref
0: Cneg = Iref; Cpos = Iani
1: Cneg = Iani; Cpos = Iref
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