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| 型號： | MC9S08RD60FG |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, MS-026BCB, LQFP-44 |
| 文件頁數(shù)： | 76/234頁 |
| 文件大?。?/td> | 1743K |
| 代理商： | MC9S08RD60FG |
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Serial Peripheral Interface (SPI) Module
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Freescale Semiconductor
167
13.2.3
SPI Baud Rate Generation
As shown in Figure 13-4, the clock source for the SPI baud rate generator is the bus clock. The three
prescale bits (SPPR2:SPPR1:SPPR0) choose a prescale divisor of 1, 2, 3, 4, 5, 6, 7, or 8. The three rate
select bits (SPR2:SPR1:SPR0) divide the output of the prescaler stage by 2, 4, 8, 16, 32, 64, 128, or 256
to get the internal SPI master mode bit-rate clock.
Figure 13-4. SPI Baud Rate Generation
13.3
Functional Description
An SPI transfer is initiated by checking for the SPI transmit buffer empty ag (SPTEF = 1) and then
writing a byte of data to the SPI data register (SPI1D) in the master SPI device. When the SPI shift register
is available, this byte of data is moved from the transmit data buffer to the shifter, SPTEF is set to indicate
there is room in the buffer to queue another transmit character if desired, and the SPI serial transfer starts.
During the SPI transfer, data is sampled (read) on the MISO1 pin at one SPSCK edge and shifted, changing
the bit value on the MOSI1 pin, one-half SPSCK cycle later. After eight SPSCK cycles, the data that was
in the shift register of the master has been shifted out the MOSI1 pin to the slave while eight bits of data
were shifted in the MISO1 pin into the master’s shift register. At the end of this transfer, the received data
byte is moved from the shifter into the receive data buffer and SPRF is set to indicate the data can be read
by reading SPI1D. If another byte of data is waiting in the transmit buffer at the end of a transfer, it is
moved into the shifter, SPTEF is set, and a new transfer is started.
Normally, SPI data is transferred most signicant bit (MSB) rst. If the least signicant bit rst enable
(LSBFE) bit is set, SPI data is shifted LSB rst.
When the SPI is congured as a slave, its SS1 pin must be driven low before a transfer starts and SS1 must
stay low throughout the transfer. If a clock format where CPHA = 0 is selected, SS1 must be driven to a
logic 1 between successive transfers. If CPHA = 1, SS1 may remain low between successive transfers. See
Section 13.3.1, “SPI Clock Formats,” for more details.
Because the transmitter and receiver are double buffered, a second byte, in addition to the byte currently
being shifted out, can be queued into the transmit data buffer, and a previously received character can be
in the receive data buffer while a new character is being shifted in. The SPTEF ag indicates when the
transmit buffer has room for a new character. The SPRF ag indicates when a received character is
available in the receive data buffer. The received character must be read out of the receive buffer (read
SPI1D) before the next transfer is nished or a receive overrun error results.
In the case of a receive overrun, the new data is lost because the receive buffer still held the previous
character and was not ready to accept the new data. There is no indication for such an overrun condition
so the application system designer must ensure that previous data has been read from the receive buffer
before a new transfer is initiated.
DIVIDE BY
2, 4, 8, 16, 32, 64, 128, or 256
DIVIDE BY
1, 2, 3, 4, 5, 6, 7, or 8
PRESCALER
CLOCK RATE DIVIDER
SPPR2:SPPR1:SPPR0
SPR2:SPR1:SPR0
BUS CLOCK
MASTER
SPI
BIT RATE
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| MC9S08RD60FGE | 功能描述:IC MCU 60K FLASH 8MHZ 44-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:S08 標(biāo)準(zhǔn)包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB（8K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285 |
| MC9S08RD60FJ | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC9S08RD60FJE | 制造商:Freescale Semiconductor 功能描述: |
| MC9S08RD60PE | 功能描述:8位微控制器 -MCU AQUILA 28LD LEAD FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC9S08RD8 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
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