參數(shù)資料
型號(hào): ATMEGA3250V-8AUR
廠商: Atmel
文件頁(yè)數(shù): 27/85頁(yè)
文件大?。?/td> 0K
描述: MCU AVR 32K FLASH 8MHZ 100TQFP
產(chǎn)品培訓(xùn)模塊: megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1,500
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 8MHz
連通性: SPI,UART/USART,USI
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 69
程序存儲(chǔ)器容量: 32KB(16K x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 1K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-TQFP
包裝: 帶卷 (TR)
其它名稱: ATMEGA3250V-8AUR-ND
PIC16(L)F1824/1828
DS41419C-page 250
Preliminary
2010-2011 Microchip Technology Inc.
25.2.3
SPI MASTER MODE
The master can initiate the data transfer at any time
because it controls the SCK line. The master
determines when the slave (Processor 2, Figure 25-5)
is to broadcast data by the software protocol.
In Master mode, the data is transmitted/received as
soon as the SSP1BUF register is written to. If the SPI
is only going to receive, the SDO output could be dis-
abled (programmed as an input). The SSP1SR register
will continue to shift in the signal present on the SDI pin
at the programmed clock rate. As each byte is
received, it will be loaded into the SSP1BUF register as
if a normal received byte (interrupts and Status bits
appropriately set).
The clock polarity is selected by appropriately
programming the CKP bit of the SSP1CON1 register
and the CKE bit of the SSP1STAT register. This then,
would give waveforms for SPI communication as
where the MSb is transmitted first. In Master mode, the
SPI clock rate (bit rate) is user programmable to be one
of the following:
FOSC/4 (or TCY)
FOSC/16 (or 4 * TCY)
FOSC/64 (or 16 * TCY)
Timer2 output/2
Fosc/(4 * (SSP1ADD + 1))
Figure 25-6 shows the waveforms for Master mode.
When the CKE bit is set, the SDO data is valid before
there is a clock edge on SCK. The change of the input
sample is shown based on the state of the SMP bit. The
time when the SSP1BUF is loaded with the received
data is shown.
FIGURE 25-6:
SPI MODE WAVEFORM (MASTER MODE)
SCK
(CKP = 0
SCK
(CKP = 1
SCK
(CKP = 0
SCK
(CKP = 1
4 Clock
Modes
Input
Sample
Input
Sample
SDI
bit 7
bit 0
SDO
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
bit 7
SDI
SSP1IF
(SMP = 1)
(SMP = 0)
(SMP = 1)
CKE = 1)
CKE = 0)
CKE = 1)
CKE = 0)
(SMP = 0)
Write to
SSP1BUF
SSP1SR to
SSP1BUF
SDO
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
(CKE = 0)
(CKE = 1)
bit 0
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