參數(shù)資料
型號(hào)： MC68HC11F1CFN2
廠商： Freescale Semiconductor
文件頁數(shù)： 4/158頁
文件大?。?/td> 0K
描述： IC MCU 512 EEPROM 2MHZ 68-PLCC
標(biāo)準(zhǔn)包裝： 18
系列： HC11
核心處理器： HC11
芯體尺寸： 8-位
速度： 2MHz
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?。?/td> 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： 68-LCC（J 形引線）
包裝： 管件
SERIAL PERIPHERAL INTERFACE
TECHNICAL DATA
8-3
Figure 8-2 SPI Transfer Format
8.2.1 Clock Phase and Polarity Controls
Software can select one of four combinations of serial clock phase and polarity using
two bits in the SPI control register (SPCR). The clock polarity is specified by the CPOL
control bit, which selects an active high or active low clock, and has no significant ef-
fect on the transfer format. The clock phase (CPHA) control bit selects one of two dif-
ferent transfer formats. The clock phase and polarity should be identical for the master
SPI device and the communicating slave device. In some cases, the phase and polar-
ity are changed between transfers to allow a master device to communicate with pe-
ripheral slaves having different requirements.
When CPHA equals zero, the SS line must be negated and reasserted between each
successive serial byte. Also, if the slave writes data to the SPI data register (SPDR)
while SS is low, a write collision error results.
When CPHA equals one, the SS line can remain low between successive transfers.
8.3 SPI Signals
The following paragraphs contain descriptions of the four SPI signals: master in slave
out (MISO), master out slave in (MOSI), serial clock (SCK), and slave select (SS).
Any SPI output line must have its corresponding data direction bit in DDRD register
set. If the DDR bit is clear, that line is disconnected from the SPI logic and becomes a
general-purpose input. All SPI input lines are forced to act as inputs regardless of the
state of the corresponding DDR bits in DDRD register.
2345678
1
SCK (CPOL = 1)
SCK (CPOL = 0)
SCK CYCLE #
SS (TO SLAVE)
654321
LSB
MSB
654321
LSB
SAMPLE INPUT
DATA OUT
SAMPLE INPUT
DATA OUT
(CPHA = 1)
(CPHA = 0)
SLAVE CPHA = 1 TRANSFER IN PROGRESS
MASTER TRANSFER IN PROGRESS
SLAVE CPHA = 0 TRANSFER IN PROGRESS
3
2
1
5
4
SS ASSERTED
MASTER WRITES
FIRST SCK EDGE
SPIF SET
SS NEGATED
1
2
3
4
5
TO SPDR
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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