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| 型號(hào)： | MC68HC05V7CFU |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁(yè)數(shù)： | 7/170頁(yè) |
| 文件大小： | 980K |
| 代理商： | MC68HC05V7CFU |
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MOTOROLA
SECTION 14: SERIAL PERIPHERAL INTERFACE
Page 90
MC68HC05V7 Specification Rev. 1.0
14.4
SPI IN STOP MODE
When the MCU enters the STOP mode, the baud rate generator which drives the SPI shuts
down. This essentially stops all master mode SPI operation; thus, the master SPI is unable
to transmit or receive any data. If the STOP instruction is executed during an SPI transfer,
that transfer is halted until the MCU exits the stop mode (provided it is an exit resulting from
a viable interrupt source). If the stop mode is exited by a reset, then the appropriate control/
status bits are cleared and the SPI is disabled. If the device is in the slave mode when the
STOP instruction is executed, the slave SPI will still operate. It can still accept data and clock
information in addition to transmitting its own data back to a master device.
At the end of a possible transmission with a slave SPI in the stop mode, no flags are set until
a viable interrupt results in an MCU "wake up". Caution should be observed when operating
the SPI (as a slave) during the stop mode because none of the protection circuitry (write
collision, mode fault, etc.) is active.
It should also be noted that when the MCU enters the stop mode all enabled output drivers
(MISO, MOSI, and SCLK ports) remain active and any sourcing currents from these outputs
will be part of the total supply current required by the device.
14.5
SPI IN WAIT MODE
The SPI subsystem remains active in wait mode. Therefore, it is consuming power. If it is
desired to reduce power, the SPI should be shut off prior to entering wait mode. A non-
resetexit from wait mode will result in the state of the SPI being unchanged. A reset exit will
return the SPI to its reset state, which is disabled.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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