參數資料
型號: MC68HC05C0FN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 4 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數: 90/96頁
文件大?。?/td> 357K
代理商: MC68HC05C0FN
Section 12: Serial Communications Interface
MOTOROLA
Page 81
MC68HC05C0 Specification Rev. 1.2
Figure 12-14: SCI Rate Generator Block Diagram
As an example of baud rate generation, suppose a 9600 Hz baud rate is desired from a
4.9152 MHz oscillator crystal. The prescaler bits (SCP1:0) could be set for either a divide-
by-one or a divide-by-four. If a divide-by-four prescaler is used, then SCR2:0 and SCT2:0
must be set for divide-by-two. If instead a divide-by-one prescaler is used, then SCR2:0 and
SCT2:0 must be set for a divide-by-eight.
SCP1 SCP0
SCT1 SCT0
SCR2 SCR1 SCR0
SCT2
fosc
INTERNAL PROCESSOR
CLOCK
DIVIDE BY 4
SCP1:0
PRESCALER
CONTROL
(DIVIDE BY SCP)
SCT2:0
TRANSMITTER
RATE
CONTROL
(DIVIDE BY SCT)
SCR2:0
RECEIVER
RATE
CONTROL
(DIVIDE BY SCR)
DIVIDE BY 16
TRANSMITTER CLOCK and BAUD RATE
RECEIVER CLOCK
BAUD RATE REGISTER - $12
765
43
21
0
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