參數(shù)資料
型號: MC68HC705C9AVFNE
廠商: Freescale Semiconductor
文件頁數(shù): 89/118頁
文件大小: 0K
描述: IC MCU 8BIT 352 BYTES RAM 44-PLC
標(biāo)準(zhǔn)包裝: 26
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 2.1MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 24
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: OTP
RAM 容量: 352 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
Serial Peripheral Interface (SPI)
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
72
Freescale Semiconductor
Figure 10-1. Data Clock Timing Diagram
10.3.1 Master In Slave Out (MISO)
The MISO line is configured as an input in a master device and as an output in a slave device. It is one
of the two lines that transfer serial data in one direction, with the most significant bit sent first. The MISO
line of a slave device is placed in the high-impedance state if the slave is not selected.
10.3.2 Master Out Slave In (MOSI)
The MOSI line is configured as an output in a master device and as an input in a slave device. It is one
of the two lines that transfer serial data in one direction with the most significant bit sent first.
10.3.3 Serial Clock (SCK)
The master clock is used to synchronize data movement both in and out of the device through its MOSI
and MISO lines. The master and slave devices are capable of exchanging a byte of information during a
sequence of eight clock cycles. Since SCK is generated by the master device, this line becomes an input
on a slave device.
As shown in Figure 10-1, four possible timing relationships may be chosen by using control bits CPOL
and CPHA in the serial peripheral control register (SPCR). Both master and slave devices must operate
with the same timing. The master device always places data on the MOSI line a half cycle before the clock
edge (SCK), in order for the slave device to latch the data.
Two bits (SPR0 and SPR1) in the SPCR of the master device select the clock rate. In a slave device,
SPR0 and SPR1 have no effect on the operation of the SPI.
10.3.4 Slave Select (SS)
The slave select (SS) input line is used to select a slave device. It has to be low prior to data transactions
and must stay low for the duration of the transaction.The SS line on the master must be tied high. In
master mode, if the SS pin is pulled low during a transmission, a mode fault error flag (MODF) is set in
MSB
5
3
64
21
0
INTERNAL STROBE FOR DATA CAPTURE (ALL MODES)
MISO/MOSI
SCK
SS
CPOL = 0
CPHA = 0
CPOL = 0
CPHA = 1
CPOL = 1
CPHA = 1
CPOL = 1
CPHA = 0
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