参数资料
型号: MC68HCL05C9AFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 160/160页
文件大小: 4128K
代理商: MC68HCL05C9AFB
Serial Peripheral Interface
SPI Registers
MC68HC05C9A Rev. 4.0
General Release Specification
Serial Peripheral Interface
NON-DISCLOSURE
AGREEMENT
REQUIRED
10.6.3 Serial Peripheral Data I/O Register (SPDR)
The serial peripheral data I/O register, shown in Figure 10-6, is used to
transmit and receive data on the serial bus. Only a write to this register
will initiate transmission/reception of another byte and this will only occur
in the master device. At the completion of transmitting a byte of data, the
SPIF status bit is set in both the master and slave devices.
When the user reads the serial peripheral data I/O register, a buffer is
actually being read. The first SPIF must be cleared by the time a second
transfer of the data from the shift register to the read buffer is initiated or
an overrun condition will exist. In cases of overrun, the byte which
causes the overrun is lost.
A write to the serial peripheral data I/O register is not buffered and
places data directly into the shift register for transmission.
$000C
Bit 7
654321
Bit 0
Read:
SPD7
SPD6
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
Write:
Reset:
UUUUUUUU
U = Undetermined
Figure 10-6. PI Data Register (SPDR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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