参数资料
型号: MC68HC11A0CP3
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP48
封装: PLASTIC, DIP-48
文件页数: 118/158页
文件大小: 3803K
代理商: MC68HC11A0CP3
SERIAL PERIPHERAL INTERFACE
MC68HC11A8
6-4
TECHNICAL DATA
6
Figure 6-3 illustrates the MOSI, MISO, SCK, and SS master-slave interconnections.
Due to data direction register control of SPI outputs and the port D wire-OR mode
(DWOM) option, the SPI system can be configured in a variety of ways. Systems with
a single bidirectional data path rather than separate MISO and MOSI paths can be ac-
commodated. Since MC68HC11A8 SPI slaves can selectively disable their MISO out-
put, a broadcast message protocol is also possible.
Figure 6-3 Serial Peripheral Interface Master-Slave Interconnection
6.4 SPI Registers
There are three registers in the serial peripheral interface which provide control, sta-
tus, and data storage functions. These registers are called the serial peripheral control
register (SPCR), serial peripheral status register (SPSR), and serial peripheral data l/
O register (SPDR) and are described in the following paragraphs.
6.4.1 Serial Peripheral Control Register (SPCR)
SPIE — Serial Peripheral Interrupt Enable
0 = SPIF interrupts disabled
1 = SPI interrupt if SPIF = 1
SPE — Serial Peripheral System Enable
0 = SPI system off
1 = SPI system on
DWOM — Port D Wire-OR Mode Option
DWOM affects all six port D pins together.
0 = Port D outputs are normal CMOS outputs
1 = Port D outputs act as open-drain outputs
7654321
0
$1028
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
SPCR
RESET
000001
U
MASTER
SLAVE
8-BIT SHIFT REGISTER
MISO
MOSI
MISO
MOSI
SCK
SS
SPI CLOCK
GENERATOR
+5V
DUAL-MCU SPI CONN
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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