參數(shù)資料
型號: MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 112/128頁
文件大小: 290K
代理商: MC68HC05G3
Page 74
MOTOROLA
Section 7: SERIAL PERIPHERAL INTERFACE (SPI)
MC68HC05G3 (705G4) Specification Rev. 1.1
7.4.3
SERIAL PERIPHERAL DATA REGISTER (SPDR
x)
READ:
A read during transmission causes DCOL
x to be set.
WRITE:
A write during transmission causes DCOL
x to be set.
The serial peripheral data register (SPDR
x) is used to transmit and receive data
on the serial bus.
In master mode, a write to this register initiates transmission/reception of data
byte.
At the completion of transmitting a byte data, the SPIF
x status bit is set. A write
to the SPDR
x is inhibited while this register is shifting (this condition causes
DCOL
x to be set) or when the SPIFx bit is set without reading SPSRx. “Data
collision” never affects the receiving and transmitting data in SPDR
x.
A write or read of the SPDR
x after accessing the SPSRx with SPIFx set will clear
SPIF
x and DCOLx bits.
The ability to access SPDR
x is inhibited when a transmission is taking place. It
is important to read the discussion defining DCOL
x and SPIFx bits to understand
the limits on using the SPDR
x.
When serial peripheral interface (SPI
x) is not used (SPEx = 0), this SPDRx can
be used as a general-purpose data storage register.
MSB
$000C
LSB
SPDR1
B7
B6
B5
B4
B3
B2
B1
B0
UUUUUUUU
RESET:
MSB
$000F
LSB
SPDR2
B7
B6
B5
B4
B3
B2
B1
B0
UUUUUUUU
RESET:
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