參數(shù)資料
型號: ATMEGA324P-B15AZ
廠商: Atmel
文件頁數(shù): 18/70頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 32KB FLASH 44TQFP
標準包裝: 1,500
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 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 ~ 125°C
封裝/外殼: 44-TQFP
包裝: 帶卷 (TR)
其它名稱: ATMEGA324P-B15AZ-ND
2011 Microchip Technology Inc.
DS41391D-page 237
PIC16(L)F1826/27
25.2.3
SPI MASTER MODE
The master can initiate the data transfer at any time
because it controls the SCKx 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 SSPxBUF register is written to. If the SPI
is only going to receive, the SDOx output could be dis-
abled (programmed as an input). The SSPxSR register
will continue to shift in the signal present on the SDIx
pin at the programmed clock rate. As each byte is
received, it will be loaded into the SSPxBUF 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 SSPxCON1 register
and the CKE bit of the SSPxSTAT 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 * (SSPxADD + 1))
Figure 25-6 shows the waveforms for Master mode.
When the CKE bit is set, the SDOx data is valid before
there is a clock edge on SCKx. The change of the input
sample is shown based on the state of the SMP bit. The
time when the SSPxBUF is loaded with the received
data is shown.
FIGURE 25-6:
SPI MODE WAVEFORM (MASTER MODE)
SCKx
(CKP = 0
SCKx
(CKP = 1
SCKx
(CKP = 0
SCKx
(CKP = 1
4 Clock
Modes
Input
Sample
Input
Sample
SDIx
bit 7
bit 0
SDOx
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
bit 7
SDIx
SSPxIF
(SMP = 1)
(SMP = 0)
(SMP = 1)
CKE = 1)
CKE = 0)
CKE = 1)
CKE = 0)
(SMP = 0)
Write to
SSPxBUF
SSPxSR to
SSPxBUF
SDOx
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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