PIC16F1933-I/SO Microchip Technology Inc., PIC16F1933-I/SO Datasheet - Page 244
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PIC16F1933-I/SO
Manufacturer Part Number
PIC16F1933-I/SO
Description
28 SOIC .300in TUBE, 7KB Flash, 256B RAM, 256B EEPROM, LCD, 1.8-5.5V
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F1933-ISS.pdf
(508 pages)
Specifications of PIC16F1933-I/SO
A/d Inputs
11-Channel, 10-Bit
Comparators
2
Cpu Speed
8 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
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
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PIC16F193X/LF193X
23.2.4
In Slave mode, the data is transmitted and received as
external clock pulses appear on SCK. When the last
bit is latched, the SSPIF interrupt flag bit is set.
Before enabling the module in SPI Slave mode, the clock
line must match the proper Idle state. The clock line can
be observed by reading the SCK pin. The Idle state is
determined by the CKP bit of the SSPCON1 register.
While in Slave mode, the external clock is supplied by
the external clock source on the SCK pin. This external
clock must meet the minimum high and low times as
specified in the electrical specifications.
While in Sleep mode, the slave can transmit/receive
data. The shift register is clocked from the SCK pin
input and when a byte is received, the device will gen-
erate an interrupt. If enabled, the device will wake-up
from Sleep.
23.2.4.1
The SPI bus can sometimes be connected in a
daisy-chain configuration. The first slave output is
connected to the second slave input, the second slave
output is connected to the third slave input, and so on.
The final slave output is connected to the master input.
Each slave sends out, during a second group of clock
pulses, an exact copy of what was received during the
first group of clock pulses. The whole chain acts as one
large communication shift register. The daisy-chain
feature only requires a single Slave Select line from the
master device.
Figure 23-7 shows the block diagram of a typical
Daisy-Chain connection when operating in SPI Mode.
In a daisy-chain configuration, only the most recent
byte on the bus is required by the slave. Setting the
BOEN bit of the SSPCON3 register will enable writes
to the SSPBUF register, even if the previous byte has
not been read. This allows the software to ignore data
that may not apply to it.
DS41364D-page 244
SPI SLAVE MODE
Daisy-Chain Configuration
Preliminary
23.2.5
The Slave Select can also be used to synchronize com-
munication. The Slave Select line is held high until the
master device is ready to communicate. When the
Slave Select line is pulled low, the slave knows that a
new transmission is starting.
If the slave fails to receive the communication properly,
it will be reset at the end of the transmission, when the
Slave Select line returns to a high state. The slave is
then ready to receive a new transmission when the
Slave Select line is pulled low again. If the Slave Select
line is not used, there is a risk that the slave will even-
tually become out of sync with the master. If the slave
misses a bit, it will always be one bit off in future trans-
missions. Use of the Slave Select line allows the slave
and master to align themselves at the beginning of
each transmission.
The SS pin allows a Synchronous Slave mode. The
SPI must be in Slave mode with SS pin control enabled
(SSPCON1<3:0> = 0100).
When the SS pin is low, transmission and reception are
enabled and the SDO pin is driven.
When the SS pin goes high, the SDO pin is no longer
driven, even if in the middle of a transmitted byte and
becomes a floating output. External pull-up/pull-down
resistors may be desirable depending on the applica-
tion.
When the SPI module resets, the bit counter is forced
to ‘0’. This can be done by either forcing the SS pin to
a high level or clearing the SSPEN bit.
Note 1: When the SPI is in Slave mode with SS pin
2: When the SPI is used in Slave mode with
3: While operated in SPI Slave mode the
SLAVE SELECT
SYNCHRONIZATION
SMP bit of the SSPSTAT register must
remain clear.
control
0100), the SPI module will reset if the SS
pin is set to V
CKE set; the user must enable SS pin
control.
enabled
2009 Microchip Technology Inc.
DD
.
(SSPCON1<3:0>
=
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