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| 型号： | ST72311J2B6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, SHRINK, PLASTIC, DIP-42 |
| 文件页数： | 59/92页 |
| 文件大小： | 624K |
| 代理商： | ST72311J2B6/XXX |
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ST72311
SERIAL PERIPHERAL INTERFACE (Cont’d)
4.5.4.2 Slave Configuration
In slave configuration, the serial clock is received
on the SCK pin from the master device.
The value of the SPR0 & SPR1 bits is not used for
the data transfer.
Procedure
– For correct data transfer, the slave device
must be in the same timing mode as the mas-
ter device (CPOL and CPHA bits). See Figure
39.
– The SS pin must be connected to a low level
signal during the complete byte transmit se-
quence.
– Clear the MSTR bit and set the SPE bit to as-
sign the pins to alternate function.
In this configuration the MOSI pin is a data input
and the MISO pin is a data output.
Transmit Sequence
The data byte is parallel loaded into the 8-bit shift
register (from the internal bus) during a write cycle
and then shifted out serially to the MISO pin most
significant bit first.
The transmit sequence begins when the slave de-
vice receives the clock signal and the most signifi-
cant bit of the data on its MOSI pin.
When data transfer is complete:
– The SPIF bit is set by hardware
– An interrupt is generated if SPIE bit is set and
I bit in CCR register is cleared.
During the last clock cycle the SPIF bit is set, a
copy of the data byte received in the shift register
is moved to a buffer. When the DR register is read,
the SPI peripheral returns this buffered value.
Clearing the SPIF bit is performed by the following
software sequence:
1. An access to the SR register while the SPIF bit
is set.
2. A write or a read of the DR register.
Notes: While the SPIF bit is set, all writes to the
DR register are inhibited until the SR register is
read.
The SPIF bit can be cleared during a second
transmission; however, it must be cleared before
the second SPIF bit in order to prevent an overrun
condition (see Section 4.5.4.6).
Depending on the CPHA bit, the SS pin has to be
set to write to the DR register between each data
byte transfer to avoid a write collision (see Section
4.5.4.4).
62
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72311J2T1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
| ST72311J2T1/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST72311J2T6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
| ST72311J2T6/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST72311J2T6S | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
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