PIC16F877-04E/PT Microchip Technology, PIC16F877-04E/PT Datasheet - Page 363

• Manufacturer Part Number: PIC16F877-04E/PT
• Description: IC MCU FLASH 8KX14 EE 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-04E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC16F87704E/PT

19.2
1997 Microchip Technology Inc.
Control Register
bit 7
bit 6
bit 5
bit 4
bit 3:0
Register 19-1: VRCON Register
bit 7
VREN: V
1 = V
0 = V
VROE: V
1 = V
0 = V
VRR: V
1 = 0V to 0.75 V
0 = 0.25 V
Unimplemented: Read as '0'
VR3:VR0: V
When VRR = 1:
V
When VRR = 0:
V
Legend
R = Readable bit
U = Unimplemented bit, read as ‘0’
REF
REF
R/W-0
VREN
output on the V
V
REF
REF
REF
REF
REF
= (VR<3:0>/ 24) V
= 1/4 * V
REF
REF
REF
is not connected to the comparator module. This voltage is disconnected from the
circuit powered on
circuit powered down
is internally connected to Comparator module’s V
pin
DD
Range selection
REF
Enable
Output Enable
to 0.75 V
R/W-0
VROE
DD
Section 19. Voltage Reference
DD
value selection 0
+ (VR3:VR0/ 32) V
, with V
REF
DD
pin
W = Writable bit
, with V
DD
DD
R/W-0
VRR
/24 step size
DD
/32 step size
VR3:VR0
DD
U-0
—
15
- n = Value at POR reset
R/W-0
VR3
REF
. This voltage level is also
R/W-0
VR2
R/W-0
VR1
DS31019A-page 19-3
bit 0
R/W-0
VR0
19