PIC16F721-E/SS Microchip Technology, PIC16F721-E/SS Datasheet - Page 49

• Manufacturer Part Number: PIC16F721-E/SS
• Description: 7 KB FLASH, 256 B SRAM, 18 I/O 20 SSOP .209in TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721-E/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REGISTER 6-4:
6.1.3
The ANSELA register
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELA bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELA bits has no affect on digital
output functions. A pin with TRIS clear and ANSEL set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
REGISTER 6-5:
 2010 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-6
bit 5-0
Note 1: Interrupt-on-change also requires that the RABIE bit of the INTCON register be set.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-5
bit 4
bit 3
bit 2-0
Note 1:
U-0
U-0
—
—
ANSELA REGISTER
Setting a pin to an analog input automatically disables the digital input circuitry. Weak pull-ups, if
available, are unaffected. The corresponding TRIS bit must be set to Input mode by the user in order to
allow external control of the voltage on the pin.
Unimplemented: Read as ‘0’
IOCA<5:0>: Interrupt-on-Change PORTA Control bits
1 =
0 =
Unimplemented: Read as ‘0’
ANSA: Analog Select between Analog or Digital Function on Pin RA<4>
0 = Digital I/O. Pin is assigned to port or digital special function.
1 = Analog input. Pin is assigned as analog input
Unimplemented: Read as ‘0’
ANSA<2:0>: Analog Select between Analog or Digital Function on Pins RA<2:0>, respectively
0 = Digital I/O. Pin is assigned to port or digital special function.
1 = Analog input. Pin is assigned as analog input
Interrupt-on-change enabled
Interrupt-on-change disabled
U-0
U-0
—
—
IOCA: INTERRUPT-ON-CHANGE PORTA REGISTER
ANSELA: PORTA ANALOG SELECT REGISTER
(Register
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
IOCA5
R/W-0
U-0
6-5) is used to
—
(1)
ANSA4
R/W-1
IOCA4
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
—
(1)
(1)
IOCA3
R/W-0
. Digital input buffer is disabled.
. Digital input buffer is disabled.
PIC16F/LF720/721
ANSA2
R/W-1
IOCA2
R/W-0
x = Bit is unknown
x = Bit is unknown
ANSA1
R/W-1
IOCA1
R/W-0
DS41430A-page 49
ANSA0
R/W-1
IOCA0
R/W-0
bit 0
bit 0