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參數(shù)資料
| 型號： | MC68HC05E0 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 64/96頁 |
| 文件大?。?/td> | 970K |
| 代理商： | MC68HC05E0 |
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8
MC68HC05E0
MOTOROLA
8-1
SERIAL INTERFACE
8
SERIAL INTERFACE
8.1
General
The serial interface (SI) on the MC68HC05E0 supports synchronous data transfer over one
bidirectional data line and a clock line. The interface can be congured to operate as a serial
peripheral interface (SPI) or as an I2C-bus interface. The microprocessor always has control of
the clock signal, and is therefore always “bus master”. The clock and data lines are multiplexed
through port E. Port E and the serial interface lines are controlled by two serial port select bits
(PS1, PS0) in the Port E/SI Mode Register ($0010.
Note that bit 3 of port E is always available as a port bit.
When PS0 and PS1 are set to select a serial function, the data register and direction register bits
for the pins used as data and clock do not inuence the state of these pins.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Port E/SI mode register
$0010
SIE
CPHA
CPOL
WL
BD‘1
BD0
PS1
PS0
0000 0000
Table 8-1 PS0, PS1: Serial Port Function Selection Bits
PS1
PS0
Function
PE0
PE1
PE2
0
Port Eas parallel port
I/O
0
1
I2C bus protocol
data
clock
I/O
1
0
SPI function
data
clock
I/O
1
SPI function
data
I/O
clock
67
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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