PIC18F26K22-I/SO Microchip Technology, PIC18F26K22-I/SO Datasheet - Page 213

• Manufacturer Part Number: PIC18F26K22-I/SO
• Description: IC PIC MCU 64KB FLASH 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F26K22-I/SO

• Core Size: 8-Bit
• Program Memory Size: 64KB (32K x 16)
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 19x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Controller Family/series: PIC18
• No. Of I/o's: 25
• Eeprom Memory Size: 1KB
• Ram Memory Size: 3896Byte
• Cpu Speed: 64MHz
• No. Of Timers: 7
• Processor Series: PIC18F
• Core: PIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 15-4:
15.2.1
The MSSPx module has five registers for SPI mode
operation. These are:
• MSSPx STATUS register (SSPxSTAT)
• MSSPx Control register 1 (SSPxCON1)
• MSSPx Control register 3 (SSPxCON3)
• MSSPx Data Buffer register (SSPxBUF)
• MSSPx Address register (SSPxADD)
• MSSPx Shift register (SSPxSR)
SSPxCON1 and SSPxSTAT are the control and
STATUS registers in SPI mode operation. The
SSPxCON1 register is readable and writable. The
lower 6 bits of the SSPxSTAT are read-only. The upper
two bits of the SSPxSTAT are read/write.
In one SPI Master mode, SSPxADD can be loaded
with a value used in the Baud Rate Generator. More
information on the Baud Rate Generator is available in
Section 15.7 “Baud Rate Generator”.
SSPxSR is the shift register used for shifting data in
and out. SSPxBUF provides indirect access to the
SSPxSR register. SSPxBUF is the buffer register to
which data bytes are written, and from which data
bytes are read.
In receive operations, SSPxSR and SSPxBUF
together create a buffered receiver. When SSPxSR
receives a complete byte, it is transferred to SSPxBUF
and the SSPxIF interrupt is set.
During transmission, the SSPxBUF is not buffered. A
write to SSPxBUF will write to both SSPxBUF and
SSPxSR.
 2010 Microchip Technology Inc.
(Not directly accessible)
SPI MODE REGISTERS
SPI Master
SPI MASTER AND MULTIPLE SLAVE CONNECTION
General I/O
General I/O
General I/O
SDOx
SCLK
SDIx
Preliminary
15.2.2
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits (SSPxCON1<5:0> and SSPxSTAT<7:6>).
These control bits allow the following to be specified:
• Master mode (SCKx is the clock output)
• Slave mode (SCKx is the clock input)
• Clock Polarity (Idle state of SCKx)
• 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)
To enable the serial port, SSPx Enable bit, SSPxEN of
the SSPxCON1 register, must be set. To reset or recon-
figure SPI mode, clear the SSPxEN bit, re-initialize the
SSPxCONx registers and then set the SSPxEN bit.
This configures the SDIx, SDOx, SCKx and SSx pins
as serial port pins. For the pins to behave as the serial
port function, some must have their data direction bits
(in the TRIS register) appropriately programmed as fol-
lows:
• SDIx must have corresponding TRIS bit set
• SDOx must have corresponding TRIS bit cleared
• SCKx (Master mode) must have corresponding
• SCKx (Slave mode) must have corresponding
• SSx must have corresponding TRIS bit set
output time)
SCKx)
TRIS bit cleared
TRIS bit set
PIC18(L)F2X/4XK22
SPI MODE OPERATION
SCLK
SDIx
SDOx
SSx
SCLK
SDIx
SDOx
SSx
SCLK
SDIx
SDOx
SSx
SPI Slave
SPI Slave
SPI Slave
#1
#2
#3
DS41412A-page 213