PIC18F1230 MICROCHIP [Microchip Technology], PIC18F1230 Datasheet - Page 162
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PIC18F1230
Manufacturer Part Number
PIC18F1230
Description
18/20/28-Pin, Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F1230.pdf
(312 pages)
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PIC18F1230/1330
14.4
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
supplied 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.
14.4.1
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 14-9:
DS39758B-page 160
INTCON
PIR1
PIE1
IPR1
RCSTA
TXREG
TXSTA
BAUDCON
SPBRGH
SPBRG
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave transmission.
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
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
CSRC
SPEN
Bit 7
REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE TRANSMISSION
—
—
—
RCIDL
ADIE
ADIP
Bit 6
ADIF
RX9
TX9
SREN
TXEN
RCIF
RCIE
RCIP
Bit 5
—
Advance Information
INT0IE
CREN
SYNC
SCKP
TXIE
TXIP
Bit 4
TXIF
CMP2IE
CMP2IP
CMP2IF
ADDEN
SENDB
BRG16
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 TXREG
register.
If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
CMP1IE
CMP1IP
TMR0IF
CMP1IF
BRGH
FERR
Bit 2
—
CMP0IE
CMP0IP
CMP0IF
INT0IF
OERR
TRMT
WUE
Bit 1
© 2006 Microchip Technology Inc.
TMR1IE
TMR1IP
TMR1IF
ABDEN
RX9D
TX9D
RBIF
Bit 0
on page
Values
Reset
41
43
43
43
42
42
42
42
42
42
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