参数资料
型号: MC68HC11D3CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PDIP40
封装: DIP-40
文件页数: 115/131页
文件大小: 1640K
代理商: MC68HC11D3CP
MOTOROLA
SERIAL PERIPHERAL INTERFACE
MC68HC11D3
8-6
TECHNICAL DATA
8.5.1 Serial Peripheral Control
SPIE — Serial Peripheral Interrupt Enable
0 = SPI interrupt disabled
1 = SPI interrupt enabled
SPE — Serial Peripheral System Enable
0 = SPI off
1 = SPI on
DWOM — Port D Wired-OR Mode
DWOM affects all six port D pins.
0 = Normal CMOS outputs
1 = Open-drain outputs
MSTR — Master Mode Select
0 = Slave mode
1 = Master mode
CPOL — Clock Polarity
When the clock polarity bit is cleared and data is not being transferred, the SCK pin of
the master device has a steady state low value. When CPOL is set, SCK idles high.
CPHA — Clock Phase
The clock phase bit, in conjunction with the CPOL bit, controls the clock-data relation-
ship between master and slave. The CPHA bit selects one of two different clocking
SPR1 and SPR0 — SPI Clock Rate Selects
These two serial peripheral rate bits select one of four baud rates to be used as SCK
if the device is a master; however, they have no effect in the slave mode.
SPCR — Serial Peripheral Control Register
$0028
Bit 7
654321
Bit 0
SPIE
SPE
DWOM
MSTR
CPOL
CPHA
SPR1
SPR0
RESET:
000001
U
SPR[1:0]
E Clock
Divide By
Frequency at
E = 2 MHz (Baud)
0 0
2
1.0 MHz
0 1
4
500 kHz
1 0
16
125 kHz
1 1
32
62.5 kHz
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