PIC18F4420-E/ML Microchip Technology, PIC18F4420-E/ML Datasheet - Page 207
PIC18F4420-E/ML
Manufacturer Part Number
PIC18F4420-E/ML
Description
IC MCU FLASH 8KX16 44QFN
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F2221-ISO.pdf
(46 pages)
2.PIC18F2420-IML.pdf
(412 pages)
3.PIC18F2420-IML.pdf
(16 pages)
4.PIC18F2420-IML.pdf
(8 pages)
5.PIC18F2420-IML.pdf
(6 pages)
6.PIC18F2420-IML.pdf
(8 pages)
7.PIC18F2420-IML.pdf
(4 pages)
Specifications of PIC18F4420-E/ML
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
36
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- PIC18F2221-ISO PDF datasheet
- PIC18F2420-IML PDF datasheet #2
- PIC18F2420-IML PDF datasheet #3
- PIC18F2420-IML PDF datasheet #4
- PIC18F2420-IML PDF datasheet #5
- PIC18F2420-IML PDF datasheet #6
- PIC18F2420-IML PDF datasheet #7
- Current page: 207 of 412
- Download datasheet (7Mb)
18.1
The BRG is a dedicated, 8-bit or 16-bit generator that
supports both the Asynchronous and Synchronous
modes of the EUSART. By default, the BRG operates
in 8-bit mode; setting the BRG16 bit (BAUDCON<3>)
selects 16-bit mode.
The SPBRGH:SPBRG register pair controls the period
of a free-running timer. In Asynchronous mode, bits,
BRGH (TXSTA<2>) and BRG16 (BAUDCON<3>), also
control the baud rate. In Synchronous mode, BRGH is
ignored. Table 18-1 shows the formula for computation
of the baud rate for different EUSART modes which
only apply in Master mode (internally generated clock).
Given the desired baud rate and F
integer value for the SPBRGH:SPBRG registers can be
calculated using the formulas in Table 18-1. From this,
the error in baud rate can be determined. An example
calculation is shown in Example 18-1. Typical baud
rates and error values for the various Asynchronous
modes
TABLE 18-1:
© 2008 Microchip Technology Inc.
Legend: x = Don’t care, n = value of SPBRGH:SPBRG register pair
SYNC
0
0
0
0
1
1
are
Baud Rate Generator (BRG)
Configuration Bits
shown
BAUD RATE FORMULAS
BRG16
0
0
1
1
0
1
in
Table 18-2.
BRGH
0
1
0
1
x
x
OSC
, the nearest
It
PIC18F2420/2520/4420/4520
may
BRG/EUSART Mode
be
16-Bit/Asynchronous
16-Bit/Asynchronous
16-Bit/Synchronous
8-Bit/Asynchronous
8-Bit/Asynchronous
8-Bit/Synchronous
advantageous to use the high baud rate (BRGH = 1) or
the 16-bit BRG to reduce the baud rate error, or
achieve a slow baud rate for a fast oscillator frequency.
Writing a new value to the SPBRGH:SPBRG registers
causes the BRG timer to be reset (or cleared). This
ensures the BRG does not wait for a timer overflow
before outputting the new baud rate.
18.1.1
The device clock is used to generate the desired baud
rate. When one of the power-managed modes is
entered, the new clock source may be operating at a
different frequency. This may require an adjustment to
the value in the SPBRG register pair.
18.1.2
The data on the RX pin is sampled three times by a
majority detect circuit to determine if a high or a low
level is present at the RX pin.
OPERATION IN POWER-MANAGED
MODES
SAMPLING
Baud Rate Formula
F
F
F
OSC
OSC
OSC
/[64 (n + 1)]
/[16 (n + 1)]
/[4 (n + 1)]
DS39631E-page 205
Related parts for PIC18F4420-E/ML
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC MCU FLASH 8KX16 EE A/D 44PLCC
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU FLASH 8KX16 EE A/D 44TQFP
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU FLASH 8KX16 EE A/D 40DIP
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU FLASH 8KX16 EE A/D 44QFN
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC PIC MCU FLASH 8KX16 44TQFP
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU CMOS 40MHZ 8K FLASH 40DIP
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU CMOS 40MHZ 8K FLSH 44TQFP
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU CMOS 40MHZ 8K FLSH 44PLCC
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC MCU FLASH 8KX16 EE A/D 44QFN
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
Microcontrollers (MCU) 48KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
Microcontrollers (MCU) 64KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet: