參數(shù)資料
型號: MC68HC05C9AMFN
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, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 85/124頁
文件大小: 774K
代理商: MC68HC05C9AMFN
SCI I/O Registers
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
63
NF — Receiver Noise Flag
This clearable, read-only flag is set when noise is detected in data received in the SCI data register.
Clear the NF bit by reading the SCSR and then reading the SCDR.
1 = Noise detected in SCDR
0 = No noise detected in SCDR
FE — Receiver Framing Error Flag
This clearable, read-only flag is set when there is a logic 0 where a stop bit should be in the character
shifted into the receive shift register. If the received word causes both a framing error and an overrun
error, the OR flag is set and the FE flag is not set. Clear the FE bit by reading the SCSR and then
reading the SCDR.
1 = Framing error
0 = No framing error
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.
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
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