PIC18F87J72-I/PT Microchip Technology, PIC18F87J72-I/PT Datasheet - Page 452

• Manufacturer Part Number: PIC18F87J72-I/PT
• Description: IC PIC MCU 8BIT 14KB FLSH 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F87J72-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 128KB (64K x 16)
• Package / Case: 80-TQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART, SPI, I2C
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 51
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14
• Controller Family/series: PIC18F
• No. Of I/o's: 51
• Ram Memory Size: 3923Byte
• Cpu Speed: 48MHz
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC18F87J72 FAMILY
B.5.7
If the user wishes to read back either of the ADC
channels continuously, or both channels continuously,
the internal address counter can be set to loop on spe-
cific register sets. In this case, there is only one control
byte on SDI to start the communication. The part stays
within the same loop until CS returns high.
This internal address counter allows the following
functionality:
• Read one ADC channel data continuously
• Read both ADC channel data continuously (both
• Read continuously the entire register map
• Read continuously each separate register
• Read continuously all Configuration registers
• Write all Configuration registers in one
FIGURE B-11: TYPICAL CONTINUOUS READ COMMUNICATION
DS39979A-page 452
ADC data can be independent or linked with
DRMODE settings)
communication (see Figure B-11)
SDO
SCK
SDI
CS
DR
CONTINUOUS COMMUNICATION,
LOOPING ON ADDRESS SETS
These bytes are not present when WIDTH=0 (16-bit mode)
CH0 ADC
ADDR/R
Upper byte
CH0 ADC
Middle byte
CH0 ADC
Lower byte
CH0 ADC
Upper byte
CH1 ADC
Middle byte
CH1 ADC
Preliminary
Lower byte
CH1 ADC
The STATUS/COM register contains the loop settings
for the internal address counter (READ<1:0>). The
internal address counter can either stay constant
(READ<1:0> = 00) and read continuously the same
byte, or it can auto-increment and loop through the
register groups defined below (READ<1:0> = 01),
register types (READ<1:0> = 10) or the entire register
map (READ<1:0> = 11).
Each channel is configured independently as either a
16-bit or 24-bit data word depending on the setting of
the corresponding WIDTH bit in the CONFIG1 register.
For continuous reading, in the case of WIDTH = 0
(16-bit), the lower byte of the ADC data is not accessed
and the part jumps automatically to the following
address (the user does not have to clock out the lower
byte since it becomes undefined for WIDTH = 0).
The following figure represents a typical, continuous
read
(DRMODE<1:0> = 00, READ<1:0> = 10) for both width
settings. This configuration is typically used for power
metering applications.
Upper byte
CH0 ADC
Middle byte
communication
CH0 ADC
Lower byte
CH0 ADC
Upper byte
CH1 ADC
 2010 Microchip Technology Inc.
Middle byte
with
CH1 ADC
Lower byte
CH1 ADC
the
default
settings