PIC24FJ256GA110 Datasheet, PDF (8/22 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit General Purpose Flash Microcontrollers with Peripheral Pin Select

PIC24FJ256GA110 FAMILY
18. Module: I²C™ Module (Master Mode)
Under certain circumstances, a module operating
in Master mode may Acknowledge its own com-
mand addressed to a slave device. This happens
when the following occurs:
• 10-Bit Addressing mode is used (A10M = 1),
and:
• the I²C master has the same two upper
address bits (I2CADD<9:8>) as the addressed
slave module.
In these cases, the master also Acknowledges the
address command and generates an erroneous I²C
slave interrupt, as well as the I²C master interrupt.
Work around
Several options are available:
• When using 10-Bit Addressing mode, make
certain that the master and slave devices do not
share the same 2 MSBs of their addresses.
If this cannot be avoided:
• Clear the A10M bit (I2CxCON<10> = 0) prior to
performing a Master mode transmit.
• Read the ADD10 bit (I2CxSTAT<8>) to check
for a full 10-bit match whenever a slave I²C
interrupt occurs on the master module.
Affected Silicon Revisions
A3 A5 A6
X
19. Module: I²C Module (Slave Mode)
Under certain circumstances, a module operating
in Slave mode may not respond correctly to some
of the special addresses reserved by the I²C
protocol. This happens when the following occurs:
• 10-Bit Addressing mode is used (A10M = 1),
and
• bits, A<7:1>, of the Slave address
(I2CADD<7:1>) fall into the range of the
reserved 7-bit address ranges, ‘1111xxx’ or
‘0000xxx’.
In these cases, the Slave module Acknowledges
the command and triggers an I²C slave interrupt; it
does not copy the data into the I2CxRCV register
or set the RBF bit.
Work around
Do not set bits, A<7:1>, of the module’s slave
address equal to ‘1111xxx’ or ‘0000xxx’.
Affected Silicon Revisions
A3 A5 A6
X
20. Module: A/D Converter
When using PGEC1 and PGED1 to debug an
application on any 64-pin devices in this family, all
voltage references will be disabled. This includes
VREF+, VREF-, AVDD and AVSS. Any A/D conversion
will always equal 3FFh.
Note: This issue applies only to 64-pin devices
in this family (PIC24FJ256GA106,
PIC24FJ192GA106 and PIC24FJ128GA106).
Work around
Use PGEC2 and PGED2 to debug any A/D
functionality.
Affected Silicon Revisions
A3 A5 A6
X
21. Module: SPIx (Enhanced Buffer Mode)
In Enhanced Master mode, the SRMPT bit
(SPIxSTAT<7>) may erroneously become set for
several clock cycles in the middle of a FIFO transfer,
indicating that the shift register is empty when it is
not. This happens when both SPIx clock prescalers
are set to values other than their maximum
(SPIxCON<4:2> ≠ 000 and SPIxCON<1:0> ≠ 00).
Work around
Configure the module to generate an SPIx event
interrupt whenever the last bit is shifted out of the
shift register (SPIxSTAT<4:2> = 101). When the
SPIxIF flag becomes set, the shift register is
empty.
Affected Silicon Revisions
A3 A5 A6
X
DS80368N-page 8
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