參數(shù)資料
型號: W78E354P
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: MONITOR MICROCONTROLLER
中文描述: 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 25/45頁
文件大?。?/td> 430K
代理商: W78E354P
W78E354
Publication Release Date: April 1997
- 25 -
Revision A1
SDAC application circuit:
8/12bit resolution
SDAC
low pass filter
Output
R
C
D1616
T = RC
Voutput = V
CC
×
n/255, if T >> T
PWM
b. 2 channels of 12-bit Static DAC
The two channel, 12-bit PWM outputs are composed of an 8-bit PWM and a 4-bit BRM (Bit Rate
Multiplier). The 4-bit BRM Reg. value decides which one is to be added one clock preiod in every 16
PWM outputs.
BRM Reg. 4-bit data One clock period is incremented in the n-th output in every 16 PWM outputs.
0000
None
0001
n = 8
0010
n = 4, 12
0100
n = 2, 6, 10, 14
1000
n = 1, 3, 5, 7, 9, 11, 13, 15
Note: See the positions marked with an "*" in the following figure.
BRM
BRM Cycle
Reg. value 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0001
-
-
-
-
-
-
-
-
*
-
-
-
-
-
-
-
0010
-
-
-
-
*
-
-
-
-
-
-
-
*
-
-
-
0100
-
-
*
-
-
-
*
-
-
-
*
-
-
-
*
-
1000
-
*
-
*
-
*
-
*
-
*
-
*
-
*
-
*
Example:
0000
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0011
-
-
-
-
*
-
-
-
*
-
-
-
*
-
-
-
1111
-
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
The 12-bit PWM frequency is the same as that of the 8-bit PWM output.
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