PIC16F916-I/SO Microchip Technology Inc., PIC16F916-I/SO Datasheet - Page 165
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PIC16F916-I/SO
Manufacturer Part Number
PIC16F916-I/SO
Description
28 PIN, 14 KB FLASH, 352 RAM, 25 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F916-ISO.pdf
(272 pages)
Specifications of PIC16F916-I/SO
A/d Inputs
5-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
14K Bytes
Ram Size
352 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Manufacturer
Quantity
Price
Part Number:
PIC16F916-I/SO
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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14.2
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits (SSPCON<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
• Clock Edge (output data on rising/falling edge of
• Clock Rate (Master mode only)
• Slave Select mode (Slave mode only)
The SSP consists of a transmit/receive shift register
(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 eight 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
(SSPCON<7>), will be set. User software must clear the
WCOL bit so that it can be determined if the following
write(s) to the SSPBUF register completed successfully.
EXAMPLE 14-1:
© 2005 Microchip Technology Inc.
LOOP
output time)
SCK)
BTFSS
BRA
MOVF
MOVWF
MOVF
MOVWF
Operation
SSPSTAT, BF
LOOP
SSPBUF, W
RXDATA
TXDATA, W
SSPBUF
LOADING THE SSPBUF (SSPSR) REGISTER
;Has data been received(transmit complete)?
;No
;WREG reg = contents of SSPBUF
;Save in user RAM, if data is meaningful
;W reg = contents of TXDATA
;New data to xmit
Preliminary
PIC16F917/916/914/913
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. 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 is only a
transmitter. Generally, the SSP interrupt is used to
determine when the transmission/reception has com-
pleted. 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 14-1 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 SSP Status register (SSPSTAT)
indicates the various status conditions.
DS41250E-page 163
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