參數資料
型號: MC68HC05C9AFN
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, PQCC44
封裝: PLASTIC, LCC-44
文件頁數: 156/160頁
文件大?。?/td> 4128K
代理商: MC68HC05C9AFN
Serial Peripheral Interface
SPI Registers
MC68HC05C9A Rev. 4.0
General Release Specification
Serial Peripheral Interface
NON-DISCLOSURE
AGREEMENT
REQUIRED
10.6 SPI Registers
Three registers in the SPI provide control, status, and data storage
functions. These registers are called the serial peripheral control register
(SPCR), serial peripheral status register (SPSR), and serial peripheral
data I/O register (SPDR) and are described in the following paragraphs.
10.6.1 Serial Peripheral Control Register (SPCR)
The SPI control register, shown in Figure 10-4, controls these functions:
Enables SPI interrupts
Enables the SPI system
Selects between standard CMOS or open drain outputs for port D
Selects between master mode and slave mode
Controls the clock/data relationship between master and slave
Determines the idle level of the clock pin
SPIE — Serial Peripheral Interrupt Enable
This read/write bit enables SPI interrupts. Reset clears the SPIE bit.
1 = SPI interrupts enabled
0 = SPI interrupts disabled
SPE — Serial Peripheral System Enable
This read/write bit enables the SPI. Reset clears the SPE bit.
1 = SPI system enabled
0 = SPI system disabled
$000A
Bit 7
654321
Bit 0
Read:
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
Write:
Reset:
000001
U
U = Undetermined
Figure 10-4. SPI Control Register (SPCR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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