PIC18F45K22-I/P Microchip Technology Inc., PIC18F45K22-I/P Datasheet - Page 266

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PIC18F45K22-I/P

Manufacturer Part Number
PIC18F45K22-I/P
Description
40 PDIP .600in TUBE, 32KB, Flash, 1536bytes-RAM, 8-bit Family, nanoWatt XLP
Manufacturer
Microchip Technology Inc.
Datasheet

Specifications of PIC18F45K22-I/P

A/d Inputs
28-Channel, 10-Bit
Comparators
2
Cpu Speed
16 MIPS
Eeprom Memory
256 Bytes
Input Output
35
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
64 MHz
Temperature Range
–40 to 125 °C
Timers
3-8-bit, 4-16-bit
Voltage, Range
1.8-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device

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PIC18(L)F2X/4XK22
16.1.1.5
The TRMT bit of the TXSTAx register indicates the
status of the TSR register. This is a read-only bit. The
TRMT bit is set when the TSR register is empty and is
cleared when a character is transferred to the TSR
register from the TXREGx. The TRMT bit remains clear
until all bits have been shifted out of the TSR register.
No interrupt logic is tied to this bit, so the user needs to
poll this bit to determine the TSR status.
16.1.1.6
The EUSART supports 9-bit character transmissions.
When the TX9 bit of the TXSTAx register is set the
EUSART will shift 9 bits out for each character transmit-
ted. The TX9D bit of the TXSTAx register is the ninth,
and Most Significant, data bit. When transmitting 9-bit
data, the TX9D data bit must be written before writing
the 8 Least Significant bits into the TXREGx. All nine
bits of data will be transferred to the TSR shift register
immediately after the TXREGx is written.
A special 9-bit Address mode is available for use with
multiple receivers. See
Detection”
FIGURE 16-3:
DS41412D-page 266
Note:
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREGx
(Transmit Buffer
(Transmit Shift
TXx/CKx
BRG Output
(Shift Clock)
TRMT bit
TXxIF bit
The TSR register is not mapped in data
memory, so it is not available to the user.
for more information on the Address mode.
TSR Status
Transmitting 9-Bit Characters
pin
ASYNCHRONOUS TRANSMISSION
Word 1
Transmit Shift Reg
Word 1
Section 16.1.2.8 “Address
1 T
CY
Start bit
bit 0
Preliminary
bit 1
Word 1
16.1.1.7
1.
2.
3.
4.
5.
6.
7.
8.
9.
Initialize the SPBRGHx:SPBRGx register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see
Baud Rate Generator
Set the RXx/DTx and TXx/CKx TRIS controls to
‘1’.
Enable the asynchronous serial port by clearing
the SYNC bit and setting the SPEN bit.
If 9-bit transmission is desired, set the TX9 con-
trol bit. A set ninth data bit will indicate that the 8
Least Significant data bits are an address when
the receiver is set for address detection.
Set the CKTXP control bit if inverted transmit
data polarity is desired.
Enable the transmission by setting the TXEN
control bit. This will cause the TXxIF interrupt bit
to be set.
If interrupts are desired, set the TXxIE interrupt
enable bit. An interrupt will occur immediately
provided that the GIE/GIEH and PEIE/GIEL bits
of the INTCON register are also set.
If 9-bit transmission is selected, the ninth bit
should be loaded into the TX9D data bit.
Load 8-bit data into the TXREGx register. This
will start the transmission.
Asynchronous Transmission Setup:
bit 7/8
 2010 Microchip Technology Inc.
(BRG)”).
Stop bit
Section 16.3 “EUSART

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