參數(shù)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(shù): 95/160頁
文件大?。?/td> 783K
代理商: MC68HC05C9A
Serial Peripheral Interface
SPI Registers
MC68HC05C9A
Rev. 4.0
General Release Specification
MOTOROLA
Serial Peripheral Interface
95
L
G
R
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
6
5
4
3
2
1
Bit 0
Read:
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
Write:
Reset:
0
0
0
0
0
1
U
U
U = Undetermined
Figure 10-4. SPI Control Register (SPCR)
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