PIC16LF1934-E/P Microchip Technology, PIC16LF1934-E/P Datasheet - Page 240
![IC PIC MCU FLASH 256KX7 40-PDIP](/photos/6/61/66192/150-40-dip_sml.jpg)
PIC16LF1934-E/P
Manufacturer Part Number
PIC16LF1934-E/P
Description
IC PIC MCU FLASH 256KX7 40-PDIP
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Datasheets
1.PIC16LF1933-ISS.pdf
(508 pages)
2.PIC16LF1933-ISS.pdf
(46 pages)
3.PIC16LF1934-IML.pdf
(418 pages)
Specifications of PIC16LF1934-E/P
Program Memory Type
FLASH
Program Memory Size
7KB (4K x 14)
Package / Case
40-DIP (0.600", 15.24mm)
Core Processor
PIC
Core Size
8-Bit
Speed
32MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
36
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 14x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Processor Series
PIC16LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
EUSART/MI2C/SPI
Maximum Clock Frequency
32 MHz
Number Of Programmable I/os
36
Number Of Timers
5
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005
Minimum Operating Temperature
- 40 C
On-chip Adc
14-ch x 10-bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
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PIC16F193X/LF193X
23.2
The Serial Peripheral Interface (SPI) bus is a
synchronous serial data communication bus that
operates in Full Duplex mode. Devices communicate in
a master/slave environment where the master device
initiates the communication. A slave device is
controlled through a chip select known as Slave Select.
The SPI bus specifies four signal connections:
• Serial Clock (SCK)
• Serial Data Out (SDO)
• Serial Data In (SDI)
• Slave Select (SS)
Figure 23-1 shows the block diagram of the MSSP
module when operating in SPI Mode.
The SPI bus operates with a single master device and
one or more slave devices. When multiple slave
devices are used, an independent Slave Select con-
nection is required from the master device to each
slave device.
Figure 23-4 shows a typical connection between a
master device and multiple slave devices.
The master selects only one slave at a time. Most slave
devices have tri-state outputs so their output signal
appears disconnected from the bus when they are not
selected.
Transmissions involve two shift registers, eight bits in
size, one in the master and one in the slave. With either
the master or the slave device, data is always shifted
out one bit at a time, with the Most Significant bit (MSb)
shifted out first. At the same time, a new Least
Significant bit (LSb) is shifted into the same register.
Figure 23-5 shows a typical connection between two
processors configured as master and slave devices.
Data is shifted out of both shift registers on the pro-
grammed clock edge and latched on the opposite edge
of the clock.
The master device transmits information out on it’s
SDO output pin which is connected to, and received by,
the slave’s SDI input pin. The slave device transmits
information out on it’s SDO output pin, which is con-
nected to, and received by, the master’s SDI input pin.
To begin communication, the master device first sends
out the clock signal. Both the master and the slave
devices should be configured for the same clock polar-
ity.
The master device starts a transmission by sending out
the MSb from it’s shift register. The slave device reads
this bit from that same line and saves it into the LSb
position of it’s shift register.
During each SPI clock cycle, a full duplex data
transmission occurs. This means that while the master
device is sending out the MSb from it’s shift register (on
it’s SDO pin) and the slave device is reading this bit and
DS41364D-page 240
SPI Mode Overview
Preliminary
saving it as the LSb of it’s shift register, that the slave
device is also sending out the MSb from it’s shift
register (on it’s SDO pin) and the master device is
reading this bit and saving it as the LSb of it’s shift
register.
After 8 bits have been shifted out, the master and slave
have exchanged register values.
If there is more data to exchange, the shift registers are
loaded with new data and the process repeats itself.
Whether the data is meaningful or not (dummy data),
depends on the application software. This leads to
three scenarios for data transmission:
• Master sends useful data and slave sends dummy
• Master sends useful data and slave sends useful
• Master sends dummy data and slave sends useful
Transmissions may involve any number of clock
cycles. When there is no more data to be transmitted,
the master stops sending the clock signal and it dese-
lects the slave.
Every slave device connected to the bus that has not
been selected through its slave select line must disre-
gard the clock and transmission signals and must not
transmit out any data of it’s own.
data.
data.
data.
2009 Microchip Technology Inc.
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