參數(shù)資料
型號(hào)： MC68HC11F1VFN2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 7/162頁
文件大?。?/td> 4554K
代理商： MC68HC11F1VFN2
SERIAL PERIPHERAL INTERFACE
MC68HC11F1
8-6
TECHNICAL DATA
SPIE — Serial Peripheral Interrupt Enable
Set the SPE bit to one to request a hardware interrupt sequence each time the SPIF
or MODF status ag is set. SPI interrupts are inhibited if this bit is clear or if the I bit in
the condition code register is one.
0 = SPI system interrupts disabled
1 = SPI system interrupts enabled
SPE — Serial Peripheral System Enable
When the SPE bit is set, the port D bit 2, 3, 4, and 5 pins are dedicated to the SPI func-
tion. If the SPI is in the master mode and DDRD bit 5 is set, then the port D bit 5 pin
becomes a general-purpose output instead of the SS input.
0 = SPI system disabled
1 = SPI system enabled
DWOM — Port D Wired-OR Mode
DWOM affects all port D pins.
0 = Normal CMOS outputs
1 = Open-drain outputs
MSTR — Master Mode Select
0 = Slave mode
1 = Master mode
CPOL — Clock Polarity
When the clock polarity bit is cleared and data is not being transferred, the SCK pin of
the master device has a steady state low value. When CPOL is set, SCK idles high.
CPHA — Clock Phase
The clock phase bit, in conjunction with the CPOL bit, controls the clock-data relation-
ship between master and slave. The CPHA bit selects one of two different clocking
SPR[1:0] — SPI Clock Rate Selects
These two bits select the SPI clock (SCK) rate when the device is configured as mas-
ter. When the device is configured as slave, these bits have no effect. Refer to Table
Table 8-1 SPI Clock Rates
SPR[1:0]
E Clock
Divide By
Frequency at
E = 2 MHz
Frequency at
E = 3 MHz
Frequency at
E = 4 MHz
Frequency at
E = 5 MHz
0 0
2
1.0 MHz
1.5 MHz
2.0 MHz
2.5 MHz
0 1
4
500 kHz
750 kHz
1.0 MHz
625 kHz
1 0
16
125 kHz
187.5 kHz
250 kHz
156.25 kHz
1 1
32
62.5 kHz
93.7 kHz
125 kHz
78.125 kHz
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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