參數(shù)資料
型號(hào): PIC18F4515T-I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 62/234頁(yè)
文件大?。?/td> 0K
描述: IC MCU FLASH 24KX16 44TQFP
標(biāo)準(zhǔn)包裝: 1,200
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,HLVD,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲(chǔ)器容量: 48KB(24K x 16)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 3.8K x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 13x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 帶卷 (TR)
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PIC18F2X1X/4X1X
DS39636D-page 156
2009 Microchip Technology Inc.
16.3.2
OPERATION
When initializing SPI operation, several options need to
be specified. This is done by programming the
appropriate
control
bits
(SSPCON1<5:0>
and
SSPSTAT<7:6>). These control bits allow the following
to be specified:
Master mode (SCK is the clock output)
Slave mode (SCK is the clock input)
Clock Polarity (Idle state of SCK)
Data Input Sample Phase (middle or end of data
output time)
Clock Edge (output data on rising/falling edge of
SCK)
Clock Rate (Master mode only)
Slave Select mode (Slave mode only)
The MSSP consists of a Transmit/Receive Shift regis-
ter (SSPSR) and a Buffer register (SSPBUF). The
SSPSR shifts the data in and out of the device, MSb
first. The SSPBUF holds the data that was written to the
SSPSR until the received data is ready. Once the 8 bits
of data have been received, that byte is moved to the
SSPBUF register. Then, the Buffer Full detect bit, BF
(SSPSTAT<0>) and the interrupt flag bit, SSPIF, are
set. This double-buffering of the received data
(SSPBUF) allows the next byte to start reception before
reading the data that was just received. Any write to the
SSPBUF register during transmission/reception of data
will be ignored and the write collision detect bit, WCOL
(SSPCON1<7>), will be set. User software must clear
the WCOL bit so that it can be determined if the follow-
ing write(s) to the SSPBUF register completed
successfully.
When the application software is expecting to receive
valid data, the SSPBUF should be read before the next
byte of data to transfer is written to the SSPBUF. The
Buffer Full bit, BF (SSPSTAT<0>), indicates when
SSPBUF has been loaded with the received data
(transmission is complete). When the SSPBUF is read,
the BF bit is cleared. This data may be irrelevant if the
SPI interface is only a transmitter. Generally, the MSSP
interrupt is used to determine when the transmission/
reception has completed. The SSPBUF must be read
and/or written. If the interrupt method is not going to be
used, then software polling can be done to ensure that
a write collision does not occur. Example 16-1 shows
the loading of the SSPBUF (SSPSR) for data
transmission.
The SSPSR is not directly readable or writable and can
only be accessed by addressing the SSPBUF register.
Additionally, the MSSP Status register (SSPSTAT)
indicates the various status conditions.
EXAMPLE 16-1:
LOADING THE SSPBUF (SSPSR) REGISTER
LOOP
BTFSS
SSPSTAT, BF
;Has data been received (transmit complete)?
BRA
LOOP
;No
MOVF
SSPBUF, W
;WREG reg = contents of SSPBUF
MOVWF
RXDATA
;Save in user RAM, if data is meaningful
MOVF
TXDATA, W
;W reg = contents of TXDATA
MOVWF
SSPBUF
;New data to xmit
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