參數(shù)資料
型號(hào): MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 105/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 68
MOTOROLA
Section 7: SERIAL PERIPHERAL INTERFACE (SPI)
MC68HC05G3 (705G4) Specification Rev. 1.1
7.3
SIGNAL DESCRIPTIONS
Three basic signals (SDI, SDO, and SCK) are described in the following paragraphs.
Figure 7-3: Clock-Data Timing Diagram shows the relationship among SCK, SDI, and
SDO.
Figure 7-3: Clock-Data Timing Diagram
7.3.1
SPI DATA I/O (SDI and SDO)
Two serial data lines, SDI for input and SDO for output, are connected to I/O port when SPI
is enabled (SPE=1).
At the falling edge of SCK, a serial data bit is transmitted out of the SDO pin. At the rising
edge of SCK, a serial data bit on the SDI pin is sampled internally.
When data is transmitted to other devices via the SDO line, the receiving data comes into
the shift register through the SDI pin. This implies full duplex transmission with both data-
out and data-in synchronized with the same clock signal. Thus, the byte transmitted is
replaced by the byte received and eliminates the need for separate transmit-empty and
receiver-full status bits. A single status bit, SPIF, is used to signify the completion of data
transfer.
MSB
BIT6
BIT5
BIT3
BIT2
BIT1
LSB
BIT4
SCK
SDO
DORD=0
MSB
BIT6
BIT5
BIT3
BIT2
BIT1
LSB
BIT4
SDI
DORD=0
LSB
BIT1
BIT2
BIT4
BIT5
BIT6
MSB
BIT3
SDO
DORD=1
LSB
BIT1
BIT2
BIT4
BIT5
BIT6
BIT3
SDI
DORD=1
DATA
SAMPLE
MSB
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