PIC18F2520-I/SO Microchip Technology Inc., PIC18F2520-I/SO Datasheet - Page 171
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PIC18F2520-I/SO
Manufacturer Part Number
PIC18F2520-I/SO
Description
28 Pin, 32 KB Flash, 1536 RAM, 25 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F2520-ISO.pdf
(390 pages)
Specifications of PIC18F2520-I/SO
A/d Inputs
10-Channel, 10-Bit
Comparators
2
Cpu Speed
10 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
32K Bytes
Ram Size
1.5K Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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17.3.8
In SPI Master mode, module clocks may be operating
at a different speed than when in full power mode; in
the case of the Sleep mode, all clocks are halted.
In most Idle modes, a clock is provided to the peripher-
als. That clock should be from the primary clock
source, the secondary clock (Timer1 oscillator at
32.768 kHz) or the INTOSC source. See Section 2.7
“Clock Sources and Oscillator Switching” for
additional information.
In most cases, the speed that the master clocks SPI
data is not important; however, this should be
evaluated for each system.
If MSSP interrupts are enabled, they can wake the con-
troller from Sleep mode, or one of the Idle modes, when
the master completes sending data. If an exit from
Sleep or Idle mode is not desired, MSSP interrupts
should be disabled.
If the Sleep mode is selected, all module clocks are
halted and the transmission/reception will remain in
that state until the devices wakes. After the device
returns to Run mode, the module will resume
transmitting and receiving data.
In SPI Slave mode, the SPI Transmit/Receive Shift
register operates asynchronously to the device. This
allows the device to be placed in any power managed
mode and data to be shifted into the SPI Transmit/
Receive Shift register. When all 8 bits have been
received, the MSSP interrupt flag bit will be set and if
enabled, will wake the device.
TABLE 17-2:
2004 Microchip Technology Inc.
INTCON
PIR1
PIE1
IPR1
TRISA
TRISC
SSPBUF
SSPCON1
SSPSTAT
Legend: Shaded cells are not used by the MSSP in SPI mode.
Note 1:
Name
2:
These bits are unimplemented in 28-pin devices; always maintain these bits clear.
PORTA<7:6> and their direction bits are individually configured as port pins based on various primary
oscillator modes. When disabled, these bits read as ‘0’.
OPERATION IN POWER MANAGED
MODES
PORTC Data Direction Control Register
SSP Receive Buffer/Transmit Register
GIE/GIEH PEIE/GIEL TMR0IE
TRISA7
PSPIF
PSPIE
PSPIP
WCOL
Bit 7
SMP
REGISTERS ASSOCIATED WITH SPI OPERATION
(1)
(1)
(1)
(2)
TRISA6
SSPOV
ADIE
ADIP
ADIF
Bit 6
CKE
(2)
PORTA Data Direction Control Register
SSPEN
RCIF
RCIE
RCIP
Bit 5
D/A
PIC18F2420/2520/4420/4520
Preliminary
INT0IE
TXIF
TXIE
TXIP
Bit 4
CKP
P
SSPM3
SSPIE
SSPIP
SSPIF
17.3.9
A Reset disables the MSSP module and terminates the
current transfer.
17.3.10
Table 17-1 shows the compatibility between the
standard SPI modes and the states of the CKP and
CKE control bits.
TABLE 17-1:
There is also an SMP bit which controls when the data
is sampled.
RBIE
Bit 3
Standard SPI Mode
S
Terminology
0, 0
0, 1
1, 0
1, 1
TMR0IF
CCP1IF
CCP1IE
CCP1IP
SSPM2
EFFECTS OF A RESET
BUS MODE COMPATIBILITY
Bit 2
R/W
SPI BUS MODES
TMR2IE
TMR2IP
TMR2IF
SSPM1
INT0IF
Bit 1
UA
CKP
Control Bits State
0
0
1
1
TMR1IF
TMR1IE
TMR1IP
SSPM0
RBIF
Bit 0
DS39631A-page 169
BF
CKE
on page
Values
Reset
1
0
1
0
49
52
52
52
52
52
50
50
50
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