參數(shù)資料
型號(hào): MB89636RP-SH
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝: SHRINK, DIP-64
文件頁數(shù): 149/153頁
文件大?。?/td> 7326K
代理商: MB89636RP-SH
MB89630 SERIES HARDWARE MANUAL
2-72
(f) Expression for Calculating Baud Rate (UART)
The baud rate is determined by the clock input selected by the clock division ratio registers (SCS1 and
SCS0). The clock inputs of the external clock and the PWM timer 1/PWM timer 2 are selectable. Each
expression for calculating baud rate is given below.
External clock selected
PWM timer 1/PWM timer 2 selected
(
)
fch: Frequency of original oscillation
= External clock input X CR
1
Baud rate
(min: 8/fch X 2)
CR = 0 ..... 16
CR = 1 ..... 64
= 1.6
s (min. value) X 16 (CR = 1)
[ex]
1
36 K baud
(fch = 10 MHz)
1
Baud rate
=
64/f ch
16/f ch
8/f ch
4/f ch
Clock gear selection
X
fch: Frequency of
original oscillation
(fch = 10 MHz)
= 0.4
s (4/f ch) X 1(SC11 = 0, SC10 = 0) X 1 (COMR1 = 0) X 2 X 16 (CR = 0)
[ex 1]
1
75 K baud
(fch = 10 MHz)
= 0.4
s (4/f ch) X 1(SC11 = 0, SC10 = 0) X 4 (COMR1 = 3) X 2 X 16 (CR = 0)
[ex 2]
1
19531 baud
1 (SC11 = 0, SC10 = 0)
8 (SC11 = 0, SC10 = 1)
16 (SC11 = 1, SC10 = 0)
64 (SC11 = 1, SC10 = 1)
Compare
register
value + 1
Input clock select bit (PWM timer)
(SC11 = SC21/SC10 = SC20)
Compare register
(COMR1/COMR2)
X 2 X CR
(
)
CR = 0 .... 16
CR = 1 .... 64
(Cycle)
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