PIC16F1937-I/P Microchip Technology, PIC16F1937-I/P Datasheet - Page 87

• Manufacturer Part Number: PIC16F1937-I/P
• Description: IC PIC MCU FLASH 512KX14 40-PDIP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: EUSART/MI2C/SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• A/d Bit Size: 10 bit
• A/d Channels Available: 14
• Height: 4.95 mm
• Length: 53.21 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Width: 14.73 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

6.2
PORTA is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISA
(Register 6-4). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 6-1 shows how to
initialize PORTA.
Reading the PORTA register (Register 6-2) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then
written to the PORT data latch (LATA).
The TRISA register (Register 6-4) controls the PORTA
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
REGISTER 6-2:
REGISTER 6-3:
© 2008 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
u = bit is unchanged
‘1’ = Bit is set
bit 7-0
Note 1:
bit 7
Legend:
R = Readable bit
u = bit is unchanged
‘1’ = Bit is set
bit 7-0
Note 1:
R/W-x/u
R/W-x/u
LATA7
RA7
PORTA Registers
Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return
of actual I/O pin values.
Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return
of actual I/O pin values.
RA<7:0>: PORTA I/O Value bits
LATA<7:0>: PORTA Output Latch Value bits
R/W-x/u
R/W-x/u
LATA6
RA6
PORTA: PORTA REGISTER
LATA: PORTA DATA LATCH REGISTER
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
R/W-x/u
R/W-x/u
LATA5
RA5
R/W-x/u
R/W-x/u
(1)
LATA4
RA4
Preliminary
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
(1)
R/W-x/u
R/W-x/u
LATA3
TRISA register are maintained set when using them as
analog inputs. I/O pins configured as analog input
always read ‘0’.
EXAMPLE 6-1:
RA3
BANKSEL PORTA
CLRF
BANKSEL LATA
CLRF
BANKSEL ANSELA
CLRF
BANKSEL TRISA
MOVLW
MOVWF
PIC16F193X/LF193X
Note:
PORTA
LATA
ANSELA
0Ch
TRISA
The ANSELA register must be initialized to
configure an analog channel as a digital
input. Pins configured as analog inputs will
read ‘0’.
R/W-x/u
R/W-x/u
LATA2
RA2
INITIALIZING PORTA
;
;Init PORTA
;Data Latch
;
;
;digital I/O
;
;Set RA<3:2> as inputs
;and set RA<7:4,1:0>
;as outputs
R/W-x/u
R/W-x/u
LATA1
RA1
DS41364A-page 85
R/W-x/u
R/W-x/u
LATA0
RA0
bit 0
bit 0