參數(shù)資料
型號(hào): MC68HC11F1CPU4
廠商: Freescale Semiconductor
文件頁數(shù): 155/158頁
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 80-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: HC11
核心處理器: HC11
芯體尺寸: 8-位
速度: 4MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 30
程序存儲(chǔ)器類型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-LQFP
包裝: 托盤
SERIAL COMMUNICATIONS INTERFACE
MC68HC11F1
7-10
TECHNICAL DATA
Figure 7-3 SCI Baud Rate Generator Block Diagram
7.7 Status Flags and Interrupts
The SCI transmitter has two status flags. These status flags can be read by software
(polled) to tell when the corresponding condition exists. Alternatively, a local interrupt
enable bit can be set to enable each of these status conditions to generate interrupt
requests when the corresponding condition is present. Status flags are automatically
set by hardware logic conditions, but must be cleared by software, which provides an
interlock mechanism that enables logic to know when software has noticed the status
indication. The software clearing sequence for these flags is automatic — functions
that are normally performed in response to the status flags also satisfy the conditions
of the clearing sequence.
OSCILLATOR
AND
CLOCK GENERATOR
(
÷4)
XTAL
EXTAL
E
AS
SCP1:SCP0
SCI
RECEIVE
BAUD RATE
(16X)
SCI
TRANSMIT
BAUD RATE
(1X)
SCR2:SCR1:SCR0
÷2
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
0:0:0
÷2
÷16
÷3
÷4
÷13
0:0
0:1
1:0
1:1
INTERNAL
BUS
CLOCK
(PH2)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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