参数资料
型号: ST72141K2B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 85/133页
文件大小: 2615K
代理商: ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
55/133
MOTOR CONTROLLER (Cont’d)
Figure 34. Step Ratio Functional Diagram
4MHz
ST[3:0] Bits
4
1 / 2Ratio
1 / 2
Zn < 55h?
MTIM Timer = FFh?
+1
-1
ck
Tratio
R+
R-
2 MHz - 62.5 Hz
Ratio > 0?
Ratio = Ratio - 1
Zn = Zn x 2
Zn+1 = Zn+1 x 2
Dn = Dn x 2
Counter = Counter x 2
Begin
End
Yes
No
Z Capture with MTIM Timer Underflow (Zn < 55h)
Ratio < Fh?
Ratio = Ratio + 1
Zn = Zn / 2
Zn+1 = Zn+1/2
Dn = Dn/2
Counter = Counter/2
Begin
End
Yes
No
MTIM Timer Overflow
MTIM Timer control over Tratio and register operation
Slow-down control
Speed-up control
Re-compute Cn
Compute Cn
MPRSR Register
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