參數(shù)資料
型號: MC68HC05C9EP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 140/144頁
文件大小: 1628K
代理商: MC68HC05C9EP
Serial Peripheral Interface (SPI)
SPI Registers
MC68HC05C9E
Advance Information
MOTOROLA
Serial Peripheral Interface (SPI)
95
N
O
N-D
I
SC
L
O
SU
R
E
AG
R
EEMENT
R
E
Q
U
IR
ED
10.6 SPI Registers
This subsection describes the three registers in the SPI which provide
control, status, and data storage functions. These registers are:
Serial peripheral control register (SPCR)
Serial peripheral status register (SPSR)
Serial peripheral data I/O register (SPDR)
10.6.1 Serial Peripheral Control Register
The SPI control register (SPCR), 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 Bit
This read/write bit enables SPI interrupts. Reset clears the SPIE bit.
1 = SPI interrupts enabled
0 = SPI interrupts disabled
Address:
$000A
Bit 7
6
54321
Bit 0
Read:
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
Write:
Reset:
00
0001
U
U = Undetermined
Figure 10-4. SPI Control Register (SPCR)
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