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參數資料
型號: MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 99/160頁
文件大小: 783K
代理商: MC68HC05C9A
Serial Peripheral Interface
SPI Registers
MC68HC05C9A
Rev. 4.0
General Release Specification
MOTOROLA
Serial Peripheral Interface
99
L
G
R
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
6
5
4
3
2
1
Bit 0
Read:
SPD7
SPD6
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
Write:
Reset:
U
U
U
U
U
U
U
U
U = Undetermined
Figure 10-6. PI Data Register (SPDR)
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相關代理商/技術參數
參數描述
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