PIC16F1933-I/SP Microchip Technology Inc., PIC16F1933-I/SP Datasheet - Page 253

• Manufacturer Part Number: PIC16F1933-I/SP
• Description: 7KB Flash, 256B RAM, 256B EEPROM, LCD, 1.8-5.5V
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1933-I/SP

• A/d Inputs: 11-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin QFN
• Programmable Memory: 7K Bytes
• Ram Size: 256 Bytes
• Speed: 32 MHz
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

23.5.2
When the R/W bit of a matching received address byte
is clear, the R/W bit of the SSPSTAT register is cleared.
The received address is loaded into the SSPBUF reg-
ister and acknowledged.
When the overflow condition exists for a received
address, then not Acknowledge is given. An overflow
condition is defined as either bit BF bit of the SSPSTAT
register is set, or bit SSPOV bit of the SSPCON1 reg-
ister is set. The BOEN bit of the SSPCON3 register
modifies this operation. For more information see
Register 23-4.
An MSSP interrupt is generated for each transferred
data byte. Flag bit, SSPIF, must be cleared by software.
When the SEN bit of the SSPCON2 register is set, SCL
will be held low (clock stretch) following each received
byte. The clock must be released by setting the CKP
bit of the SSPCON1 register, except sometimes in
10-bit mode. See Section 23.2.3 “SPI Master Mode”
for more detail.
23.5.2.1
This section describes a standard sequence of events
for the MSSP module configured as an I
7-bit Addressing mode. All decisions made by hard-
ware or software and their effect on reception.
Figure 23-13 and Figure 23-14 is used as a visual
reference for this description.
This is a step by step process of what typically must
be done to accomplish I
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Software clears SSPIF.
11. Software reads the received byte from SSPBUF
12. Steps 8-12 are repeated for all received bytes
13. Master sends Stop condition, setting P bit of
 2009 Microchip Technology Inc.
Start bit detected.
S bit of SSPSTAT is set; SSPIF is set if interrupt
on Start detect is enabled.
Matching address with R/W bit clear is received.
The slave pulls SDA low sending an ACK to the
master, and sets SSPIF bit.
Software clears the SSPIF bit.
Software reads received address from SSPBUF
clearing the BF flag.
If SEN = 1; Slave software sets CKP bit to
release the SCL line.
The master clocks out a data byte.
Slave drives SDA low sending an ACK to the
master, and sets SSPIF bit.
clearing BF.
from the Master.
SSPSTAT, and the bus goes idle.
SLAVE RECEPTION
7-bit Addressing Reception
2
C communication.
2
C Slave in
Preliminary
23.5.2.2
Slave device reception with AHEN and DHEN set
operate the same as without these options with extra
interrupts and clock stretching added after the 8th fall-
ing edge of SCL. These additional interrupts allow the
slave software to decide whether it wants to ACK the
receive address or data byte, rather than the hard-
ware. This functionality adds support for PMBus™ that
was not present on previous versions of this module.
This list describes the steps that need to be taken by
slave software to use these options for I
cation. Figure 23-15 displays a module using both
address and data holding. Figure 23-16 includes the
operation with the SEN bit of the SSPCON2 register
set.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Slave clears SSPIF.
11. SSPIF set and CKP cleared after 8th falling
12. Slave looks at ACKTIM bit of SSPCON3 to
13. Slave reads the received data from SSPBUF
14. Steps 7-14 are the same for each received data
15. Communication is ended by either the slave
PIC16F193X/LF193X
Note: SSPIF is still set after the 9th falling edge of
S bit of SSPSTAT is set; SSPIF is set if interrupt
on Start detect is enabled.
Matching address with R/W bit clear is clocked
in. SSPIF is set and CKP cleared after the 8th
falling edge of SCL.
Slave clears the SSPIF.
Slave can look at the ACKTIM bit of the
SSPCON3 register to determine if the SSPIF
was after or before the ACK.
Slave reads the address value from SSPBUF,
clearing the BF flag.
Slave sets ACK value clocked out to the master
by setting ACKDT.
Slave releases the clock by setting CKP.
SSPIF is set after an ACK, not after a NACK.
If SEN = 1 the slave hardware will stretch the
clock after the ACK.
edge of SCL for a received data byte.
determine the source of the interrupt.
clearing BF.
byte.
sending an ACK = 1, or the master sending a
Stop condition. If a Stop is sent and Interrupt on
Stop Detect is disabled, the slave will only know
by polling the P bit of the SSTSTAT register.
SCL even if there is no clock stretching and
BF has been cleared. Only if NACK is sent to
Master is SSPIF not set
7-bit Reception with AHEN and
DHEN
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C commun-