参数资料
型号: MC68HC11D0CP3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 105/124页
文件大小: 1481K
代理商: MC68HC11D0CP3
MC68HC11D3
SERIAL PERIPHERAL INTERFACE
MOTOROLA
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 slave select (SS) line must be negated and reasserted
between each successive serial byte. Also, if the slave writes data to the SPI data reg-
ister (SPDR) while SS is active 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 SS.
SPI TRANSFER FORMAT 1
2345678
1
SCK (CPOL = 1)
SCK (CPOL = 0)
SCK CYCLE #
SS (TO SLAVE)
654321
LSB
MSB
654321
LSB
1
2
3
5
4
SLAVE CPHA=1 TRANSFER IN PROGRESS
MASTER TRANSFER IN PROGRESS
SLAVE CPHA=0 TRANSFER IN PROGRESS
1. SS ASSERTED
2. MASTER WRITES TO SPDR
3. FIRST SCK EDGE
4. SPIF SET
5. SS NEGATED
SAMPLE INPUT
DATA OUT
(CPHA = 0)
SAMPLE INPUT
DATA OUT
(CPHA = 1)
相关PDF资料
PDF描述
MPC8264ACZUMIBX 32-BIT, 266 MHz, RISC PROCESSOR, PBGA480
MT5TL4L32T-70IT SPECIALTY MICROPROCESSOR CIRCUIT, PQFP100
MT5TL4L32T-90IT SPECIALTY MICROPROCESSOR CIRCUIT, PQFP100
MB90F546GSPFV 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
MB90W234ZFV 16-BIT, UVPROM, 16 MHz, MICROCONTROLLER, CQFP100
相关代理商/技术参数
参数描述
MC68HC11D0FB 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MC68HC11D0FN 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MC68HC11D0FNR2 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MC68HC11D0P 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MC68HC11D3 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter