PIC18F4520-I/P Microchip Technology Inc., PIC18F4520-I/P Datasheet - Page 222

• Manufacturer Part Number: PIC18F4520-I/P
• Description: 40 Pin, 32 KB Flash, 1536 RAM, 36 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4520-I/P

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• 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

PIC18F2420/2520/4420/4520
18.4
Synchronous Slave mode is entered by clearing bit,
CSRC (TXSTA<7>). This mode differs from the
Synchronous Master mode in that the shift clock is sup-
plied externally at the CK pin (instead of being supplied
internally in Master mode). This allows the device to
transfer or receive data while in any low-power mode.
18.4.1
The operation of the Synchronous Master and Slave
modes are identical, except in the case of the Sleep
mode.
If two words are written to the TXREG and then the
SLEEP instruction is executed, the following will occur:
a)
b)
c)
d)
e)
TABLE 18-9:
DS39631A-page 220
INTCON
PIR1
PIE1
IPR1
RCSTA
TXREG
TXSTA
BAUDCON
SPBRGH
SPBRG
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave transmission.
Note 1:
Name
The first word will immediately transfer to the
TSR register and transmit.
The second word will remain in the TXREG
register.
Flag bit, TXIF, will not be set.
When the first word has been shifted out of TSR,
the TXREG register will transfer the second
word to the TSR and flag bit, TXIF, will now be
set.
If enable bit TXIE is set, the interrupt will wake the
chip from Sleep. If the global interrupt is enabled,
the program will branch to the interrupt vector.
EUSART Synchronous
Slave Mode
Reserved in 28-pin devices; always maintain these bits clear.
EUSART SYNCHRONOUS
SLAVE TRANSMISSION
EUSART Transmit Register
EUSART Baud Rate Generator Register, High Byte
EUSART Baud Rate Generator Register, Low Byte
GIE/GIEH PEIE/GIEL TMR0IE
ABDOVF
PSPIE
PSPIP
PSPIF
CSRC
SPEN
Bit 7
REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE TRANSMISSION
(1)
(1)
(1)
RCIDL
ADIE
ADIP
Bit 6
ADIF
RX9
TX9
SREN
TXEN
RCIF
RCIE
RCIP
Bit 5
—
Preliminary
INT0IE
CREN
SYNC
SCKP
TXIF
TXIE
TXIP
Bit 4
ADDEN
SENDB
BRG16
SSPIE
SSPIP
SSPIF
To set up a Synchronous Slave Transmission:
1.
2.
3.
4.
5.
6.
7.
8.
RBIE
Bit 3
Enable the synchronous slave serial port by
setting bits SYNC and SPEN and clearing bit
CSRC.
Clear bits CREN and SREN.
If interrupts are desired, set enable bit TXIE.
If 9-bit transmission is desired, set bit TX9.
Enable the transmission by setting enable bit
TXEN.
If 9-bit transmission is selected, the ninth bit
should be loaded in bit TX9D.
Start transmission by loading data to the
TXREGx register.
If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
TMR0IF
CCP1IE
CCP1IP
CCP1IF
BRGH
FERR
Bit 2
—
TMR2IF
TMR2IE
TMR2IP
INT0IF
OERR
TRMT
WUE
Bit 1
 2004 Microchip Technology Inc.
TMR1IE
TMR1IP
TMR1IF
ABDEN
RX9D
TX9D
RBIF
Bit 0
on page
Values
Reset
49
52
52
52
51
51
51
51
51
51