PIC18F46J11-I/PT Microchip Technology, PIC18F46J11-I/PT Datasheet - Page 310

• Manufacturer Part Number: PIC18F46J11-I/PT
• Description: IC PIC MCU FLASH 64KB 44-TQFP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F46J11-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 64KB (32K x 16)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 34
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2.15 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3776 B
• Interface Type: EUSART, I2C, SPI
• Maximum Clock Frequency: 48 MHz
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164136, DM183022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 13 Channel
• Package: 44TQFP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• Operating Supply Voltage: 2.5|3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F46J11 FAMILY
18.5.10
Transmission of a data byte, a 7-bit address or the
other half of a 10-bit address, is accomplished by
simply writing a value to the SSPxBUF register. This
action will set the Buffer Full flag bit, BF, and allow the
BRG to begin counting and start the next transmission.
Each bit of address/data will be shifted out onto the
SDAx pin after the falling edge of SCLx is asserted (see
data hold time specification parameter 106). SCLx is
held low for one BRG rollover count (T
should be valid before SCLx is released high (see data
setup time specification parameter 107). When the
SCLx pin is released high, it is held that way for T
The data on the SDAx pin must remain stable for that
duration and some hold time after the next falling edge
of SCLx. After the eighth bit is shifted out (the falling
edge of the eighth clock), the BF flag is cleared and the
master releases SDAx. This allows the slave device
being addressed to respond with an ACK bit during the
ninth bit time if an address match occurred, or if data
was received properly. The status of ACK is written into
the ACKDT bit on the falling edge of the ninth clock.
If the master receives an Acknowledge, the Acknowl-
edge Status bit, ACKSTAT, is cleared; if not, the bit is
set. After the ninth clock, the SSPxIF bit is set and the
master clock (BRG) is suspended until the next data
byte is loaded into the SSPxBUF, leaving SCLx low and
SDAx unchanged (Figure 18-23).
After the write to the SSPxBUF, each bit of the address
will be shifted out on the falling edge of SCLx until all
seven address bits and the R/W bit are completed. On
the falling edge of the eighth clock, the master will
deassert the SDAx pin, allowing the slave to respond
with an Acknowledge. On the falling edge of the ninth
clock, the master will sample the SDAx pin to see if the
address was recognized by a slave. The status of the
ACK bit is loaded into the ACKSTAT status bit
(SSPxCON2<6>). Following the falling edge of the
ninth clock transmission of the address, the SSPxIF
flag is set, the BF flag is cleared and the BRG is turned
off until another write to the SSPxBUF takes place,
holding SCLx low and allowing SDAx to float.
18.5.10.1
In Transmit mode, the BF bit (SSPxSTAT<0>) is set
when the CPU writes to SSPxBUF and is cleared when
all eight bits are shifted out.
18.5.10.2
If the user writes the SSPxBUF when a transmit is
already in progress (i.e., SSPxSR is still shifting out a
data byte), the WCOL bit is set and the contents of the
buffer are unchanged (the write does not occur) after
2 T
within 2 T
updated. This may result in a corrupted transfer.
DS39932C-page 310
CY
after the SSPxBUF write. If SSPxBUF is rewritten
CY
I
TRANSMISSION
2
, the WCOL bit is set and SSPxBUF is
C MASTER MODE
BF Status Flag
WCOL Status Flag
BRG
). Data
BRG
.
The user should verify that the WCOL bit is clear after
each write to SSPxBUF to ensure the transfer is correct.
In all cases, WCOL must be cleared in software.
18.5.10.3
In Transmit mode, the ACKSTAT bit (SSPxCON2<6>)
is cleared when the slave has sent an Acknowledge
(ACK = 0) and is set when the slave does not Acknowl-
edge (ACK = 1). A slave sends an Acknowledge when
it has recognized its address (including a general call),
or when the slave has properly received its data.
18.5.11
Master mode reception is enabled by programming the
Receive Enable bit, RCEN (SSPxCON2<3>).
The BRG begins counting and on each rollover, the
state of the SCLx pin changes (high-to-low/low-to-high)
and data is shifted into the SSPxSR. After the falling
edge of the eighth clock, the receive enable flag is
automatically cleared, the contents of the SSPxSR are
loaded into the SSPxBUF, the BF flag bit is set, the
SSPxIF flag bit is set and the BRG is suspended from
counting, holding SCLx low. The MSSP is now in Idle
state awaiting the next command. When the buffer is
read by the CPU, the BF flag bit is automatically
cleared. The user can then send an Acknowledge bit at
the end of reception by setting the Acknowledge
Sequence Enable bit, ACKEN (SSPxCON2<4>).
18.5.11.1
In receive operation, the BF bit is set when an address
or data byte is loaded into SSPxBUF from SSPxSR. It
is cleared when the SSPxBUF register is read.
18.5.11.2
In receive operation, the SSPOV bit is set when 8 bits
are received into the SSPxSR and the BF flag bit is
already set from a previous reception.
18.5.11.3
If users write the SSPxBUF when a receive is already
in progress (i.e., SSPxSR is still shifting in a data byte),
the WCOL bit is set and the contents of the buffer are
unchanged (the write does not occur).
Note:
I
The MSSP module must be in an inactive
state before the RCEN bit is set or the
RCEN bit will be disregarded.
2
ACKSTAT Status Flag
C MASTER MODE RECEPTION
BF Status Flag
SSPOV Status Flag
WCOL Status Flag
© 2009 Microchip Technology Inc.