參數(shù)資料
型號: MC68HC05C9ECP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 62/106頁
文件大?。?/td> 659K
代理商: MC68HC05C9ECP
SCI I/O Registers
MC68HC05C9E Advance Information Data Sheet, Rev. 0.1
Freescale Semiconductor
59
9.11.5 Baud Rate Register
The baud rate register (BAUD), shown in Figure 9-12, selects the baud rate for both the receiver and the
transmitter.
SCP1 — SCP0–SCI Prescaler Select Bits
These read/write bits control prescaling of the baud rate generator clock, as shown in Table 9-1. Reset
clears both SCP1 and SCP0.
SCR2 — SCR0–SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate, as shown in Table 9-2. Resets have no effect on the
SCR2–SCR0 bits.
Address: $000D
Bit 7
6543
2
1
Bit 0
Read:
SCP1
SCP0
SCR2
SCR1
SCR0
Write:
Reset:
0
U
= Unimplemented
U = Unaffected
Figure 9-12. Baud Rate Register (BAUD)
Table 9-1. Baud Rate Generator Clock Prescaling
SCP1 and SCP0
Baud Rate Generator Clock
0 0
Internal clock
÷ 1
0 1
Internal clock
÷ 3
1 0
Internal clock
÷ 4
1 1
Internal clock
÷ 13
Table 9-2. Baud Rate Selection
SCR2, SCR1, and SCR0
SCI Baud Rate (Baud)
0 0 0
Prescaled clock
÷ 1
0 0 1
Prescaled clock
÷ 2
0 1 0
Prescaled clock
÷ 4
0 1 1
Prescaled clock
÷ 8
1 0 0
Prescaled clock
÷ 16
1 0 1
Prescaled clock
÷ 32
1 1 0
Prescaled clock
÷ 64
1 1 1
Prescaled clock
÷ 128
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