PIC16F737-I/SP Microchip Technology Inc., PIC16F737-I/SP Datasheet - Page 150

• Manufacturer Part Number: PIC16F737-I/SP
• Description: 28 PIN, 7 KB FLASH, 368 RAM, 25 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F737-I/SP

• A/d Inputs: 5-Channel, 8-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 7K Bytes
• Ram Size: 192 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

PIC16F7X7
11.4
Synchronous Slave mode differs from the Master mode
in the fact that the shift clock is supplied externally at
the RC6/TX/CK pin (instead of being supplied internally
in Master mode). This allows the device to transfer or
receive data while in Sleep mode. Slave mode is
entered by clearing bit, CSRC (TXSTA<7>).
11.4.1
The operation of the Synchronous Master and Slave
modes is identical, except in the case of 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 11-12: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE TRANSMISSION
DS30498C-page 148
0Bh, 8Bh,
10Bh,18Bh
0Ch
18h
19h
8Ch
98h
99h
Legend:
Note 1:
Address
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 and if the global interrupt is
enabled, the program will branch to the interrupt
vector (0004h).
AUSART Synchronous Slave
Mode
x = unknown, — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave transmission.
Bits PSPIE and PSPIF are reserved on 28-pin devices; always maintain these bits clear.
AUSART SYNCHRONOUS SLAVE
TRANSMIT
INTCON
PIR1
RCSTA
TXREG
PIE1
TXSTA
SPBRG
Name
AUSART Transmit Data Register
Baud Rate Generator Register
PSPIF
PSPIE
CSRC
SPEN
Bit 7
GIE
(1)
(1)
PEIE
ADIF
ADIE
Bit 6
RX9
TX9
TMR0IE INT0IE
SREN
TXEN
RCIF
RCIE
Bit 5
CREN ADDEN
SYNC
TXIF
TXIE
Bit 4
SSPIF
SSPIE
RBIE
Bit 3
—
When setting up a Synchronous Slave Transmission,
follow these steps:
1.
2.
3.
4.
5.
6.
7.
8.
TMR0IF
CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000
CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000
BRGH
FERR
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, then set enable bit
TXIE.
If 9-bit transmission is desired, then 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 GIE and PEIE
(bits 7 and 6) of the INTCON register are set.
Bit 2
INT0IF
OERR
TRMT
Bit 1
RX9D
TX9D
RBIF
Bit 0
 2004 Microchip Technology Inc.
0000 000x 0000 000u
0000 000x 0000 000x
0000 0000 0000 0000
0000 -010 0000 -010
0000 0000 0000 0000
POR, BOR
Value on:
Value on
all other
Resets