PIC24FV16KM204 Datasheet, PDF (138/336 Pages) Microchip Technology – General Purpose, 16-Bit Flash Microcontroller with XLP Technology Data Sheet

PIC24FV16KM204 FAMILY
11.1.1 OPEN-DRAIN CONFIGURATION
In addition to the PORT, LAT and TRIS registers for
data control, each port pin can also be individually con-
figured for either digital or open-drain output. This is
controlled by the Open-Drain Control register, ODCx,
associated with each port. Setting any of the bits
configures the corresponding pin to act as an
open-drain output.
The maximum open-drain voltage allowed is the same
as the maximum VIH specification.
11.2 Configuring Analog Port Pins
The use of the ANSx and TRISx registers control the
operation of the A/D port pins. The port pins that are
desired as analog inputs must have their correspond-
ing TRISx bit set (input). If the TRISx bit is cleared
(output), the digital output level (VOH or VOL) will be
converted.
When reading the PORTx register, all pins configured
as analog input channels will read as cleared (a low
level). Analog levels on any pin that is defined as a dig-
ital input (including the ANx pins) may cause the input
buffer to consume current that exceeds the device
specifications.
11.2.1 ANALOG SELECTION REGISTER
I/O pins with shared analog functionality, such as A/D
inputs and comparator inputs, must have their digital
inputs shut off when analog functionality is used. Note
that analog functionality includes an analog voltage
being applied to the pin externally.
To allow for analog control, the ANSx registers are
provided. There is one ANSx register for each port
(ANSA, ANSB and ANSC). Within each ANSx register,
there is a bit for each pin that shares analog
functionality with the digital I/O functionality.
If a particular pin does not have an analog function, that
bit is unimplemented. See Register 11-1 to Register 11-3
for implementation.
REGISTER 11-1: ANSA: ANALOG SELECTION (PORTA)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
—
ANSA4⁽¹⁾
ANSA3
ANSA2
ANSA1
ANSA0
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-5
bit 4-0
Unimplemented: Read as ‘0’
ANSA<4:0>: Analog Select Control bits⁽¹⁾
1 = Digital input buffer is not active (use for analog input)
0 = Digital input buffer is active
Note 1: The ANSA4 bit is not available on 20-pin devices.
DS33030A-page 138
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